Stanford quarterback Andrew Luck passes a pro scouts watch in background during Stanford football Pro Day on the Stanford University campus in Stanford, Calif., Thursday, March 22, 2012. (AP Photo/Paul Sakuma)

Running back Trent Richardson works out during Alabama Pro Day. (Photo by Kent Gidley/Alabama Athletics)

Texas Longhorns linebacker Emmanuel Acho runs a drill during Texas' pro day on March 20, 2012 in Austin, TX. (Jan Allgood/University of Texas)

Quarterback Ryan Tannehill works out during Texas A&M Pro Day. (Texas A&M Athletics)

Stanford quarterback Andrew Luck waits with other Stanford players during Stanford football Pro Day on the Stanford University campus in Stanford, Calif., Thursday, March 22, 2012. (AP Photo/Paul Sakuma)

Stanford guard David DeCastro goes through drills during Stanford football Pro Day on the Stanford University campus in Stanford, Calif., Thursday, March 22, 2012. (AP Photo/Paul Sakuma)

Stanford quarterback Andrew Luck during Stanford football Pro Day on the Stanford University campus in Stanford, Calif., Thursday, March 22, 2012. (AP Photo/Paul Sakuma)

LSU defensive tackle Michael Brockers runs through drills as NFL scouts watch at LSU's football Pro Timing Day in Baton Rouge, La., Thursday, March 22, 2012. (AP Photo/Gerald Herbert)

Boise State's Kellen Moore works out in front of pro scouts during Boise State football Pro Day on Thursday, March 22, 2012 in Boise, Idaho. (AP Photo/Matt Cilley)

Quarterback Robert Griffin III runs a drill during Baylor University's pro day on March 21, 2012 in Waco, TX. (Baylor University)

Quarterback Robert Griffin III runs a drill during Baylor University's pro day on March 21, 2012 in Waco, TX. (Baylor University)

Washington Red Skins head coach Mike Shanahan, left, and Baylor head coach Art Briles, right, talk at the start of an NFL Pro Day workout at Baylor University Wednesday, March 21, 2012, in Waco, Texas. (AP Photo/Tony Gutierrez)

Heisman Trophy winner Robert Griffin III shows up for a Baylor football pro day Wednesday, March 21, 2012, in Waco, Texas. (AP Photo/Tony Gutierrez)

Quinton Coples works his way through a drill during North Carolina's pro football day in Chapel Hill, N.C., Tuesday, March 20, 2012. (AP Photo/Bob Leverone)

Former North Carolina receiver Brooks Foster runs the 40 during North Carolina's pro football day in Chapel Hill, N.C., Tuesday, March 20, 2012. (AP Photo/Bob Leverone)

Texas Longhorns running back Cody Johnson works out during Texas' pro day on March 20, 2012 in Austin, TX. (Jan Allgood/University of Texas)

Texas Longhorns defensive lineman Kheeston Randall goes through a drill during Texas' pro day on March 20, 2012 in Austin, TX. (Jan Allgood/University of Texas)

Chicago Bears head coach Lovie Smith poses with Texas Longhorns head coach Mack Brown during Texas' pro day on March 20, 2012 in Austin, TX. (Jan Allgood/University of Texas)

Oklahoma defensive end Frank Alexander participates in the vertical leap measurement during NFL football pro day in Norman, Okla., Wednesday, March 14, 2012. (AP Photo/Alonzo Adams)

Florida running back Chris Rainey catches a pass during drills at NFL football pro day, Tuesday, March 13, 2012, in Gainesville, Fla. (AP Photo/John Raoux)

Florida defensive tackle Jaye Howard runs through a drill during NFL football pro day, Tuesday, March 13, 2012, in Gainesville, Fla. (AP Photo/John Raoux)

Oklahoma defensive end Ronnell Lewis participates in agility drill during NFL football pro day in Norman, Okla., Wednesday, March 14, 2012. (AP Photo/Alonzo Adams)

Dont'a Hightower runs drills in front of NFL scouts on NFL Pro Day at the University of Alabama on Wednesday, March 7, 2012, in Tuscaloosa, Ala. (AP Photo/Butch Dill)

NFL scouts time DeQuan Menzie in the 40 on NFL Pro Day at the University of Alabama on Wednesday, March 7, 2012, in Tuscaloosa, Ala. (AP Photo/Butch Dill)

Mar 7, 2012; Tuscaloosa, AL, USA; Alabama Crimson Tide defensive back DeQuan Menzie (24) during pro day at the indoor practice facility at the University of Alabama. Mandatory Credit: Spruce Derden-US PRESSWIRE

Southern California defensive end Nick Perry works out during NFL football pro days on Wednesday, March 7, 2012, in Los Angeles. (AP Photo/Bret Hartman)

Southern California Marc Tyler runs the 40-yard-dash during an NFL football pro day, Wednesday, March 7, 2012, in Los Angeles. (AP Photo/Bret Hartman)

Miami wide receiver Travis Benjamin runs a drill in front of NFL football scouts during a pro day workout on Thursday, March 8, 2012, in Coral Gables, Fla. (AP Photo/Alan Diaz)

Washington NCAA college football player Alameda Ta'amu takes part in an agility drill during at UW's NFL pro day on Thursday, March 8, 2012, in Seattle. (AP Photo/Ted S. Warren)

Oklahoma State's Grant Garner has his hand measured during NFL football pro day in Stillwater, Okla., Friday, March 9, 2012. (AP Photo/Sue Ogrocki)

Mar 7, 2012; Tuscaloosa, AL, USA; Alabama Crimson Tide defensive back Dre Kirkpatrick (21) during pro day at the indoor practice facility at the University of Alabama. Mandatory Credit: Spruce Derden-US PRESSWIRE

March 7, 2012; Madison, WI, USA; Wisconsin Badgers quarterback Russell Wilson prepares to throw a pass during pro day at the McClain Center. Mandatory Credit: Mary Langenfeld-US PRESSWIRE

Mar 9, 2012; Stillwater, OK, USA; Oklahoma State Cowboys quarterback Brandon Weeden throws a pass during the Oklahoma State pro day at Boone Pickens Stadium. Mandatory Credit: Mark D. Smith-US PRESSWIRE

Justin Blackmon catches a pass during NFL football pro day in Stillwater, Okla., Friday, March 9, 2012. (AP Photo/Sue Ogrocki)

Florida running back Chris Rainey catches a pass during drills at NFL football pro day, Tuesday, March 13, 2012, in Gainesville, Fla. (AP Photo/John Raoux)

Florida defensive tackle Jaye Howard runs through a drill during NFL football pro day,Tuesday, March 13, 2012, in Gainesville, Fla. (AP Photo/John Raoux)

Mar 7, 2012; College Station, TX, USA; Texas A&M Aggies defensive back Coryell Judie completes a shuttle drill during pro day at the McFerrin Indoor Facility. Mandatory Credit: Brett Davis-US PRESSWIRE

Miami quarterback Jacory Harris prepares to pass during NFL football pro day at the University of Miami, Thursday, March 8, 2012, in Coral Gables, Fla. (AP Photo/Alan Diaz)

Southern California offensive tackle Matt Kalil, right, does a blocking drill with offensive guard Martin Coleman during NFL football pro days,Wednesday, March 7, 2012, in Los Angeles. (AP Photo/Bret Hartman)

Heisman Trophy winner and former Baylor quarterback Robert Griffin III during Baylor pro day Wednesday, March 21, 2012, in Waco, Texas. (AP Photo/Tony Gutierrez)

Washington Redskins head football coach Mike Shanahan, left, and Baylor football coach Art Briles, right, during Baylor pro day Wednesday, March 21, 2012, in Waco, Texas. (AP Photo/Tony Gutierrez)

Heisman Trophy winner and former Baylor quarterback Robert Griffin III prepares to pass during Baylor pro day Wednesday, March 21, 2012, in Waco, Texas. (AP Photo/Tony Gutierrez)

LSU cornerback Morris Claiborne runs through drills during a pro day workout in Baton Rouge, La., Thursday, March 22, 2012.(AP Photo/Gerald Herbert)

New York Jets head coach Rex Ryan talks to reporters about acquiring NFL quarterback Tim Tebow from the Denver Broncos at the LSU football Pro Timing Day in Baton Rouge, Thursday, March 22, 2012. (AP Photo/Gerald Herbert)

Boise State's Kyle Efaw works out in front of pro scouts during Boise State football Pro Day on Thursday, March 22, 2012 in Boise, Idaho. (AP Photo/Matt Cilley)

LSU defensive tackle Michael Brockers (90) defensive end Kendrick Adams (94) recover during a workout for NFL scouts at LSU's college football Pro Timing Day in Baton Rouge, la., Thursday, March 22, 2012. (AP Photo/Gerald Herbert)