New England Patriots wide receiver Wes Welker (83) runs after catching a pass during practice at the NFL football team's facility in Foxborough, Mass., Thursday, June 7, 2012. (AP Photo/Stephan Savoia)

Washington Redskins wide receiver Leonard Hankerson catches a pass during practice at Redskins Park in Ashburn, Va., Thursday, June 7, 2012. (AP Photo/Cliff Owen)

Carolina Panthers wide receiver Steve Smith catches a pass during NFL football practice in Charlotte, N.C., Thursday, June 7, 2012. (AP Photo/Chuck Burton)

Pittsburgh Steelers quarterback Ben Roethlisberger catches the ball as he wears a jersey with the number 78 during NFL football practice on Thursday, June 7, 2012 at Heinz Field in Pittsburgh. (AP Photo/Keith Srakocic)

New York Jets quarterback Tim Tebow, second from left, works out with the quarterbacks during NFL football practice, Thursday, June 7, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

Houston Texans quarterback T.J. Yates sets to pass during an NFL football practice, Thursday, June 7, 2012, in Houston. (AP Photo/Dave Einsel)

Cleveland Browns rookie running back Trent Richardson runs an agility drill during practice at the NFL football team's headquarters in Berea, Ohio Thursday, June 7, 2012. (AP Photo/Mark Duncan)

The Pittsburgh Steelers stretch during the NFL football practice on Thursday, June 7, 2012, at Heinz Field in Pittsburgh. (AP Photo/Keith Srakocic)

New York Jets wide receiver Santonio Holmes laughs as he runs with the ball during NFL football practice, Thursday, June 7, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

Tampa Bay Buccaneers wide receiver Vincent Jackson runs after a reception during an optional training session Tuesday, June 5, 2012, in Tampa, Fla. (AP Photo/Chris O'Meara)

Cleveland Browns wide receiver Greg Little catches a pass during practice at the NFL football team's headquarters in Berea, Ohio Tuesday, June 5, 2012. Plagued by dropped passes as a rookie, Little spent the offseason dropping weight. He lost 11 pounds and re-shaped his sculpted body by changing his diet with the hope it will make him quicker on the field this season. (AP Photo/Mark Duncan)

Tampa Bay Buccaneers quarterback Josh Freeman (5) throws a pass as running back Robert Hughes (33) looks on during practice Tuesday, June 5, 2012, in Tampa, Fla. (AP Photo/Chris O'Meara)

Cleveland Browns wide receiver Josh Cribbs (16) catches a pass over the hands of Rod Windsor during practice at the NFL football team's headquarters in Berea, Ohio Tuesday, June 5, 2012. (AP Photo/Mark Duncan)

Houston Texans' Owen Daniels makes a catch during an NFL football practice, Tuesday, June 5, 2012, in Houston. (AP Photo/Dave Einsel)

Denver Broncos quarterback Peyton Manning throws a pass during NFL football practice at the team's training facility in Englewood, Colo., on Monday, June 4, 2012. (AP Photo/Ed Andrieski)

Cincinnati Bengals center Reggie Stephens (62) hits a blocking pad during their NFL football organized team activity, Monday, June 4, 2012, at Paul Brown Stadium in Cincinnati. (AP Photo/Al Behrman)

Cincinnati Bengals center Kyle Cook cools off during their NFL football organized team activity, Monday, June 4, 2012, at Paul Brown Stadium in Cincinnati. (AP Photo/Al Behrman)

Detroit Lions running back Jahvid Best catches a ball during NFL footballl practice in Allen Park, Mich., Monday, June 4, 2012. (AP Photo/Paul Sancya)

Houston Texans' Justin Forsett runs through a drill during an NFL football practice, Monday, June 4, 2012, in Houston. (AP Photo/Dave Einsel)

Detroit Lions quarterbacks Kellen Moore (17), Matthew Stafford (9), and Shaun Hill (14) run during a NFL footballl practice in Allen Park, Mich., Monday, June 4, 2012. (AP Photo/Paul Sancya)

Carolina Panthers' Mike Tolbert, right, and DeAngelo Williams, left, celebrate after a drill during an NFL football practice in Charlotte, N.C., Friday, June 1, 2012. Tolbert was pretty comfortable playing in San Diego, but when the Panthers came calling Tolbert left more than $1 million on the table to return to the East coast and play for the Panthers. (AP Photo/Chuck Burton)

New York Jets quarterbacks Mark Sanchez, left, and Tim Tebow workout during NFL football practice, Thursday, May 31, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

Carolina Panthers' Mike Tolbert runs a drill during an NFL football practice in Charlotte, N.C., Friday, June 1, 2012. Tolbert was pretty comfortable playing in San Diego, but when the Panthers came calling Tolbert left more than $1 million on the table to return to the East Coast and play for the Panthers. (AP Photo/Chuck Burton)

Tennessee Titans quarterback Jake Locker laughs as he warms up during NFL football practice at the team's training facility on Friday, June 1, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Tennessee Titans linebacker Will Witherspoon (92) runs a drill as rookie linebacker Zach Brown, right, blocks him during NFL football practice at the team's training facility on Friday, June 1, 2012, in Nashville, Tenn. Watching at left is defensive coordinator Jerry Gray. (AP Photo/Mark Humphrey)

Tennessee Titans running back Javon Ringer (21), wide receiver Nate Washington (85), running back Chris Johnson (28) and wide receiver Lavelle Hawkins (87) warm up during NFL football practice at the team's training facility on Friday, June 1, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Philadelphia Eagles' Ronald Johnson practices during a rainstorm at the team's NFL football training facility, Friday, June 1, 2012, in Philadelphia. (AP Photo/Matt Rourke)

New England Patriots quarterback Tom Brady throws a pass during NFL football practice at the team's training facility in Foxborough, Mass., Thursday, May 31, 2012. (AP Photo/Stephan Savoia)

New England Patriots wide receiver Julian Edelman catches a pass during NFL football practice at the team's training facility in Foxborough, Mass., Thursday, May 31, 2012. (AP Photo/Stephan Savoia)

Philadelphia Eagles' Evan Mathis sticks his tongue out after practice at the team's NFL football training facility, Thursday, May 31, 2012, in Philadelphia. (AP Photo/Matt Rourke)

New York Jets quarterbacks Mark Sanchez, right, and Tim Tebow, left, listen to quarterbacks coach Matt Cavanaugh, center, during NFL football practice, Thursday, May 31, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

Pittsburgh Steelers wide receiver Antonio Brown (84) juggles three footballs as Toney Clemons (11) looks on during a break at NFL football practice on Thursday, May 31, 2012 in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers punter Drew Butler (9) blows a bubble as he warms up with the team during NFL football practice on Thursday, May 31, 2012 in Pittsburgh. (AP Photo/Keith Srakocic)

Washington Redskins quarterback Robert Griffin III works out during NFL football practice at Redskins Park in Ashburn, Va., Thursday, May 31, 2012. (AP Photo/Susan Walsh)

New Orleans Saints acting head coach Joe Vitt talks with linebacker Curtis Lofton (50) during practice at their NFL football training facility in Metairie, La., Thursday, May 31, 2012. (AP Photo/Gerald Herbert)

Chicago Bears wide receiver Devin Hester (23) talks with wide receiver Johnny Knox during an NFL football practice in Lake Forest, Ill., Wednesday, May 30, 2012. (AP Photo/Nam Y. Huh)

Minnesota Vikings running back Adrian Peterson works on strengthening his left knee with head trainer Eric Sugarman, left, during an optional workout at the team's Winter Park NFL football practice facility, Wednesday, May 30, 2012, in Eden Prairie, Minn. (AP Photo/Genevieve Ross)

Chicago Bears wide receiver Alshon Jeffery (17) catches a ball during an NFL football practice in Lake Forest, Ill., Wednesday, May 30, 2012. (AP Photo/Nam Y. Huh)

Chicago Bears quarterback Jay Cutler (6) throws to wide receiver Brandon Marshall (15) during an NFL football practice in Lake Forest, Ill., Wednesday, May 30, 2012. (AP Photo/Nam Y. Huh)

San Diego Chargers wide receiver Richard Goodman makes a catch during an NFL football practice, Wednesday, May 30, 2012, in San Diego. (AP Photo/Gregory Bull)

Dallas Cowboys running back DeMarco Murray (29) is chased by linebacker Bruce Carter (54) during NFL football practice at Cowboys Stadium, Wednesday, May 30, 2012 in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys owner Jerry Jones watches his team from the sidelines during NFL football practice at Cowboys Stadium, Wednesday, May 30, 2012 in Arlington, Texas. Jones says he has no interest in going to federal court to seek relief after an arbitrator upheld the NFL's salary cap reductions against the Dallas Cowboys and Washington Redskins. (AP Photo/LM Otero)

Atlanta Falcons' Asante Samuel takes the field for a football practice Tuesday, May 29, 2012, in Flowery Branch, Ga.?(AP Photo/David Goldman)

Cleveland Browns running back Trent Richardson runs during NFL football practice at the team's headquarters in Berea, Ohio on Wednesday, May 30, 2012. (AP Photo/Amy Sancetta)

Baltimore Ravens starting quarterback Joe Flacco (5) leads quarterbacks Tyrod Taylor? (2), Curtis Painter (8) and Chester Stewart (1) through a drill during an NFL football practice in Owings Mills, Md., Wednesday, May 30, 2012. (AP Photo/Patrick Semansky)

Baltimore Ravens linebacker Dannell Ellerbe, left, and cornerback Chykie Brown run a drill during an NFL football practice in Owings Mills, Md., Wednesday, May 30, 2012. (AP Photo/Patrick Semansky)

Pittsburgh Steelers linebacker LaMarr Woodley (56) goes through drills with Brandon Hicks (44) during the NFL football practice on Wednesday, May 30, 2012 in Pittsburgh. (AP Photo/Keith Srakocic)

Atlanta Falcons wide receiver Roddy White works out during a football practice Tuesday, May 29, 2012, in Flowery Branch, Ga.?(AP Photo/David Goldman)

San Francisco 49ers quarterback Alex Smith throws a pass during NFL football practice at the team's training facility in Santa Clara, Calif., Tuesday, May 29, 2012. (AP Photo/Paul Sakuma)

Buffalo Bills' Mario Williams (94) runs drill with Bills' Kyle Moore (54) during NFL football practice in Orchard Park, N.Y., Tuesday, May 29, 2012. (AP Photo/David Duprey)

Buffalo Bills' Stephon Gilmore (27) makes a catch during NFL football practice in Orchard Park, N.Y., Tuesday, May 29, 2012.(AP Photo/David Duprey)

San Diego Chargers quarterback Philip Rivers warms up during an NFL football training Tuesday, May 29, 2012, in San Diego. (AP Photo/Gregory Bull)

Detroit Lions wide receiver Calvin Johnson catches a ball at an NFL football practice in Allen Park, Mich., Tuesday, May 29, 2012. (AP Photo/Paul Sancya)

May 29, 2012; Allen Park, MI, USA; Detroit Lions linebacker DeAndre Levy (54) during organized team activities at Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

The Detroit Lions run at an NFL football organized training activity practice in their indoor Allen Park, Mich., facility Tuesday, May 29, 2012. (AP Photo/Paul Sancya)

New York Jets quarterback Tim Tebow throws during NFL football practice, Thursday, May 24, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

Seattle Seahawks quarterback Tavaris Jackson (7) passes to Justin Helwege, left, as quarterbacks Russell Wilson (3) and Matt Flynn (15) look on, during an NFL football organized team activity, Thursday, May 24, 2012, in Renton, Wash. (AP Photo/Ted S. Warren)

New York Jets quarterback Mark Sanchez throws during NFL football practice, Thursday, May 24, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

Jacksonville Jaguars quarterback Blaine Gabbert throws a pass during an NFL football practice, Thursday, May 24, 2012, in Jacksonville, Fla. (AP Photo/John Raoux)

Houston Texans rookie linebacker Whitney Mercilus runs a drill during an NFL football practice, Thursday, May 24, 2012, in Houston. (AP Photo/Dave Einsel)

New England Patriots quarterback Tom Brady throws during an NFL football team workout in Foxborough, Mass., Thursday, May 24, 2012. (AP Photo/Charles Krupa)

Pittsburgh Steelers linebackers Mortty Ivy, left, and Chris Carter, right, perform a drill during NFL practice on Thursday, May 24, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Cam Newton (1) jokes with running backs DeAngelo Williams (34) and Jonathan Stewart (28) as the three make their way to the practice fields at the Carolina Panthers training facility in Charlotte, N.C., Thursday, May 24, 2012. (AP Photo/Bob Leverone)

Quarterback Cam Newton (1) winds up to throw a pass at the Carolina Panthers training center in Charlotte, N.C., Thursday, May 24, 2012. (AP Photo/Bob Leverone)

New York Jets head coach Rex Ryan, left, and offensive coordinator Tony Sparano talk during team practice Thursday, May 24, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

New York Jets rookie wide receiver Stephen Hill makes a catch during team practice Thursday, May 24, 2012, in Florham Park, N.J. (AP Photo/Julio Cortez)

New Orleans Saints quarterback Chase Daniel, right, hands off to running back Chris Ivory during practice at their NFL football training facility in Metairie, La., Thursday, May 24, 2012. (AP Photo/Gerald Herbert)

New Orleans Saints running back Pierre Thomas runs through drills during practice at their NFL football training facility in Metairie, La., Thursday, May 24, 2012. (AP Photo/Gerald Herbert)

Philadelphia Eagles guard Danny Watkins works during an NFL football practice at their training facility Thursday, May 24, 2012 in Philadelphia. (AP Photo/Alex Brandon)

San Francisco 49ers quarterback Alex Smith prepares to pass as coach Jim Harbaugh watches during NFL football practice in Santa Clara, Calif., Wednesday, May 23, 2012. (AP Photo/Paul Sakuma)

Baltimore Ravens cornerback Lardarius Webb prepares to catch a ball during NFL football practice in Owings Mills, Md., Wednesday, May 23, 2012. (AP Photo/Patrick Semansky)

Chicago Bears wide receiver Brandon Marshall, right, catches a pass as defensive back Tim Jennings defends during NFL football practice, Wednesday, May 23 2012, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

Dallas Cowboys quarterback Tony Romo passes during a NFL football practice, Wednesday, May 23, 2012, in Irving, Texas. (AP Photo/Tony Gutierrez)

Philadelphia Eagles running back LeSean McCoy hops an obstacle during an NFL football practice at their training facility, Wednesday, May 23, 2012, in Philadelphia. (AP Photo/Alex Brandon)

San Francisco 49ers wide receiver Randy Moss catches a pass during practice at the NFL football team's training facility in Santa Clara, Calif., Wednesday, May 23, 2012. (AP Photo/Paul Sakuma)

Dallas Cowboys wide receiver Dez Bryant (88) reaches up to grab a pass during an organized team activity, Wednesday, May 23, 2012, in Irving, Texas. (AP Photo/Tony Gutierrez)

Baltimore Ravens starting quarterback Joe Flacco, right, throws a pass as quarterback Curtis Painter looks on during NFL football practice in Owings Mills, Md., Wednesday, May 23, 2012. (AP Photo/Patrick Semansky)

Baltimore Ravens outside linebacker Courtney Upshaw runs a drill during NFL football practice in Owings Mills, Md., Wednesday, May 23, 2012. (AP Photo/Patrick Semansky)

Pittsburgh Steelers safety Ike Taylor catches a ball during NFL football practice, Wednesday, May 23, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers quarterback Ben Roethlisberger (7) passes as quarterbacks Jerrod Johnson (8) and Charlie Batch (16) await their turn during NFL football practice, Wednesday, May 23, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers wide receiver Toney Clemons runs through a pair of practice dummies during NFL football practice, Wednesday, May 23, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Philadelphia Eagles running back Graig Cooper runs after taking the handoff from quarterback Trent Edwards during an NFL football practice at their training facility Tuesday, May 22, 2012 in Philadelphia. (AP Photo/Alex Brandon)

Houston Texans offensive lineman Andrew Gardner (66) warms up with Rashad Butler, bottom, during NFL football practice, Tuesday, May 22, 2012, in Houston. (AP Photo/Dave Einsel)

Houston Texans offensive lineman Andrew Gardner, center, works out during an NFL football practice session Tuesday, May 22, 2012, in Houston. (AP Photo/Dave Einsel)

May 21, 2012; Allen Park, MI, USA; Detroit Lions tight end Tony Scheffler (85) gets away from safety Alonzo Lawrence (41) during organized team activities at Detroit Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

May 21, 2012; Houston, TX, USA; Houston Texans quarterback John Beck (12) participates in the organized team activities at Methodist Training Center. Mandatory Credit: Thomas Campbell-US PRESSWIRE

Cleveland Browns quarterback Brandon Weeden passes during practice at the NFL football team's headquarters in Berea, Ohio Tuesday, May 22, 2012. (AP Photo/Mark Duncan)

May 21, 2012; Houston, TX, USA; Houston Texans wide receiver Keshawn Martin (82) participates in the organized team activities at Methodist Training Center. Mandatory Credit: Thomas Campbell-US PRESSWIRE

May 22, 2012; Pittsburgh, PA, USA; Pittsburgh Steelers quarterback Ben Roethlisberger (7) throws the ball during organized team activities at the Steelers training facility. Mandatory Credit: Charles LeClaire-US PRESSWIRE

May 22, 2012; Pittsburgh, PA, USA; Pittsburgh Steelers defensive linemen practice breaking off the line of scrimmage as assistant head coach John Mitchell (lower right) observes during organized team activities at the Steelers training facility. Mandatory Credit: Charles LeClaire-US PRESSWIRE

May 22, 2012; Davie, FL, USA; Miami Dolphins running back Reggie Bush (22) during organized team activities at the Dolphins training facility. Mandatory Credit: Steve Mitchell-US PRESSWIRE

May 22, 2012; Davie, FL, USA; Miami Dolphins linebacker Kevin Burnett (56) during organized team activities at the Dolphins training facility. Mandatory Credit: Steve Mitchell-US PRESSWIRE

Pittsburgh Steelers tight end Jamie McCoy (80) catches a pass during a drill as quarterback Byron Leftwich, left, works from the other side of the field on the first day of NFL football practice at the team's training facility on Tuesday, May 22, 2012 in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers defensive tackle Steve McLendon, left, hits a blocking sled as Ziggy Hood (96) watches during the first day of NFL football practice at the team's training facility on Tuesday, May 22, 2012 in Pittsburgh. (AP Photo/Keith Srakocic)

Oakland Raiders quarterback Carson Palmer directs teammates during NFL football practice in Alameda, Calif., Tuesday, May 22, 2012. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders linebacker Rolando McClain goes through drills during NFL football practice in Alameda, Calif., Tuesday, May 22, 2012. (AP Photo/Marcio Jose Sanchez)

Denver Bronocs wide receiver Tyler Grisham reaches to pull in a pass during minicamp at the NFL team's football training facility in Englewood, Colo., on Monday, May 21, 2012. (AP Photo/Ed Andrieski)

Denver Broncos quarterback Peyton Manning (18) throws a pass during minicamp at the NFL team's football training facility in Englewood, Colo., on Monday, May 21, 2012. (AP Photo/Ed Andrieski)

Washington Redskins rookie quarterback Robert Griffin III throws a pass during an organized team activity for the NFL football team on Monday, May 21, 2012 in Ashburn, Va. (AP Photo/Evan Vucci)

Kansas City Chiefs quarterback Matt Cassel (7) talks with quarterbacks coach Jim Zorn during NFL football practice at the team's training facility in Kansas City, Mo., Monday, May 21, 2012. (AP Photo/Orlin Wagner)