Former Pittsburgh Steelers Hall-of Fame running back Franco Harris greets members of the one time Pittsburgh Steelers cheerleaders, the Steelerettes, before an NFL football game between the Pittsburgh Steelers and the Cincinnati Bengals on Sunday, Dec. 15, 2013 in Pittsburgh. (AP Photo/Gene J. Puskar)

Former Pittsburgh Steelers cornerback Mel Blount greets members of the one time Pittsburgh Steelers cheerleaders, the Steelerettes, before an NFL football game between the Pittsburgh Steelers and the Cincinnati Bengals on Sunday, Dec. 15, 2013 in Pittsburgh. (AP Photo/Gene J. Puskar)

Former Tampa Bay Buccaneers linebacker Derrick Brooks reacts to a play while watching from the sidelines during the first half of an NFL football game on Sunday, Dec. 15, 2013, in Tampa, Fla. The 49ers won 33-14. (AP Photo/Reinhold Matay)

Former Indianapolis Colts running back Marshall Faulk addresses the crowd as he was inducted in the team's "Ring of Honor" as owner Jim Irsay looks on during half time of an NFL football game against the Houston Texans in Indianapolis, Sunday, Dec. 15, 2013. (AP Photo/AJ Mast)

Former Minnesota Viking John Randle acknowledges the crowd during a ceremony honoring the All Mall of America Field team during half time of an NFL football game between the Vikings and the Philadelphia Eagles, Sunday, Dec. 15, 2013, in Minneapolis. (AP Photo/Andy King)

Former Minnesota Viking Steve Hutchinson acknowledges the crowd during a ceremony honoring the All Mall of America Field team during half time of an NFL football game between the Vikings and the Philadelphia Eagles, Sunday, Dec. 15, 2013, in Minneapolis. (AP Photo/Andy King)

Former Minnesota Viking Daunte Culpepper acknowledges the crowd during a ceremony honoring the All Mall of America Field team during half time of an NFL football game between the Vikings and the Philadelphia Eagles, Sunday, Dec. 15, 2013, in Minneapolis. (AP Photo/Andy King)

Former Jacksonville Jaguars quarterback Mark Brunell, center, mascot Jaxson de Ville, left, and owner Shahid Kahn, right, watch a highlight video of Brunell's career during a halftime ceremony inducting him into the team's Pride of the Jaguars honor group during an NFL football game against the against the Buffalo Bills in Jacksonville, Fla., Sunday, Dec. 15, 2013.(AP Photo/Phelan M. Ebenhack)

Former Minnesota Vikings players, from left, Steve Jordan, Chris Doleman, Daunte Culpepper and Ryan Longwell pose for a photo before a ceremony honoring the All Mall of America Field team during half time of an NFL football game between the Vikings and the Philadelphia Eagles, Sunday, Dec. 15, 2013, in Minneapolis. (AP Photo/Andy King)

Former Jacksonville Jaguars running back Fred Taylor acknowledges the crowd after being introduced with other former players prior to an NFL football game against the Buffalo Bills in Jacksonville, Fla., Sunday, Dec. 15, 2013.(AP Photo/Phelan M. Ebenhack)

Indianapolis Colts owner Jim Irsay , right, introduces former Colts running back Erik Dickerson as he was inducted in the team's "Ring of Honor" during half time of an NFL football game against the Houston Texans in Indianapolis, Sunday, Dec. 15, 2013. (AP Photo/AJ Mast)

Former Indianapolis Colts running back Erik Dickerson addresses the crowd as he was inducted in the team's "Ring of Honor" during half time of an NFL football game against the Houston Texans in Indianapolis, Sunday, Dec. 15, 2013. (AP Photo/AJ Mast)

Former Denver Broncos quarterback John Elway and former running back Terrell Davis speak on the NFL Network set prior to the NFL regular season game between the San Diego Chargers and the Denver Broncos on Dec. 12, 2013 at Sports Authority Field at Mile High in Denver. (Ric Tapia/NFL)

From left, former Denver Broncos players Terrell Davis, Tom Nalen, Haven Moses, Randy Gradishar and Rod Smith walk off the field after watching the coin toss before an NFL football game against the San Diego Chargers, Thursday, Dec. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

Former Denver Broncos Karl Mecklenburg holds a football trophy during the Homecoming ceremony at half time of an NFL football game between the Denver Broncos and the San Diego Chargers, Thursday, Dec. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

The NFL Homecoming logo adorns the field at Sports Authority Field at Mile High during an NFL football game between the Denver Broncos and the San Diego Chargers, Thursday, Dec. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

Former Denver Bronco Louis Wright presents the state title trophy to the Liberty Stratton football team during the half time Homecoming ceremony at an NFL football game between the Denver Broncos and the San Diego Chargers, Thursday, Dec. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

Referee Bill Vinovich (52) shows the coin toSan Diego Chargers and Denver Broncos team captains for the coin toss of an NFL football game, Thursday, Dec. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

(L-R) Chicago Bears President and CEO Ted Phillips, Chairman George McKaskey, and former player and coach Mike Ditka look on as Ditka's number 89 jersey is retired during a halftime ceremony of an NFL football game between the Chicago Bears and Dallas Cowboys at Soldier Field on Monday, Dec. 9, 2013, in Chicago, IL. (Todd Rosenberg/NFL)

Former Chicago Bears player and coach Mike Ditka speaks to fans as his number 89 jersey is retired during a halftime ceremony of an NFL football game between the Chicago Bears and Dallas Cowboys at Soldier Field on Monday, Dec. 9, 2013, in Chicago, IL. (Todd Rosenberg/NFL)

Former Chicago Bears tight end and coach Mike Ditka waits to take the stage for the ceremony retiring his jersey and sweater at Soldier Field in Chicago, IL on December 9, 2013. (Todd Rosenberg/NFL)

Former Chicago Bears player and football coach Mike Ditka acknowledges fans as he takes the stage for a ceremony to retire his No. 89 during halftime of an NFL football game between the Bears and Dallas Cowboys, Monday, Dec. 9, 2013, in Chicago. The Hall of Famer is the 14th Bear to have his number retired by the team. (AP Photo/Charles Rex Arbogast)

Former Tampa Bay Buccaneers player Warren Sapp wipes his face after being inducted in the Ring of Honor ceremony during halftime in an NFL football game between the Tampa Bay Buccaneers and the Miami Dolphins in Tampa, Fla., Monday, Nov. 11, 2013.(AP Photo/Phelan M. Ebenhack)

Former Tampa Bay Buccaneers defensive lineman Warren Sapp acknowledges spectators in the stands after being inducted into the team's Ring of Honor during a halftime ceremony of an NFL football game against the Miami Dolphins in Tampa, Fla., Monday, Nov. 11, 2013.(AP Photo/Phelan M. Ebenhack)

Former Tampa Bay Buccaneers defensive lineman Warren Sapp speaks after being inducted into the team's Ring of Honor during a halftime ceremony of an NFL football game against the Miami Dolphins in Tampa, Fla., Monday, Nov. 11, 2013.(AP Photo/Phelan M. Ebenhack)

Former Tampa Bay Buccaneers defensive lineman Warren Sapp, center, poses with family members after being inducted into the team's Ring of Honor during a halftime ceremony of an NFL football game against the Miami Dolphins in Tampa, Fla., Monday, Nov. 11, 2013.(AP Photo/Phelan M. Ebenhack)

Former Tampa Bay Buccaneers defensive tackle Warren Sapp waves to the fans after being inducted into the team's ring of Honor during an NFL football game against the Miami Dolphins Monday, Nov. 11, 2013, in Tampa, Fla. (AP Photo/Brian Blanco)

Former New York Jets wide receiver Wesley Walker, left, Hall of Fame quarterback Joe Namath, center, and Hall of Fame wide receiver Don Maynard, right, participate in a New York Jets Ring of Honor ceremony honoring former Jets defensive tackle Marty Lyons during a halftime ceremony of an NFL football game between the New York Jets and the Pittsburgh Steelers Sunday, Oct. 13, 2013, in East Rutherford, N.J. (AP Photo/Kathy Willens)

Former Dallas Cowboys Jay Novacek and Chad Hennings during an NFL football game, against the Washington Redskins Sunday, Dec. 19, 2010 in Arlington, Texas. (AP Photo/Sharon Ellman)

Former Buffalo Bills quarterback Jim Kelly waves during ceremonies at halftime of an NFL football game against the Carolina Panthers Sunday, Sept. 15, 2013, in Orchard Park, N.Y. (AP Photo/Gary Wiepert)

Former Minnesota Vikings wide receiver Cris Carter, left, talks with Thursday Night Football analyst Michael Irvin, right, before an NFL football game between the Minnesota Vikings and the Washington Redskins, Thursday, Nov. 7, 2013, in Minneapolis. (AP Photo/Ann Heisenfelt)

Former Los Angeles Raiders player Bo Jackson waves after lighting a torch for former owner Al Davis before an NFL football game between the Oakland Raiders and the Tennessee Titans in Oakland, Calif., Sunday, Nov. 24, 2013. (AP Photo/Ben Margot)

New Orleans Saints head coach Sean Payton, left, leads a cheer with former Saints player Steve Gleason, who suffers from ALS, before an NFL football game against the Atlanta Falcons in New Orleans, Sunday, Sept. 8, 2013. (AP Photo/Bill Haber)

Oakland Raiders hall of famers, from left, Willie Brown, John Madden, and Rod Woodson during an NFL football game in Oakland, Calif., Thursday, Dec. 6, 2012. (AP Photo/Marcio Jose Sanchez)

Former Chicago Bears players Mike Pyle (50) and Ed O'Bradovich talk with each other during halftime of an NFL football game, Sunday, Sept. 15, 2013, in Chicago. The 1963 Bears team, which won the NFL Championship over the New York Giants, was honored during halftime. (AP Photo/Jim Prisching)

Former Chicago Bears players cornerback Larry Glueck (43), defensive tackle John Johnson (76) and offensive guard Ted Karras (67) are seen on the field during halftime of an NFL football game, Sunday, Sept. 15, 2013, in Chicago. The 1963 Bears team, which won the NFL Championship over the New York Giants, was honored during halftime. (AP Photo/Jim Prisching)

Former Detroit Lions and NFL Hall of Fame members, from left, Lem Barney, Barry Sanders and Charlie Sanders are introduced during an alumni celebration at half time of the Detroit Lions NFL football game against the Dallas Coyboys in Detroit, Sunday, Oct. 27, 2013. (AP Photo/Duane Burleson)

Former NFL player Jerry Rice waves before an NFL football game between the San Francisco 49ers and the Indianapolis Colts in San Francisco, Sunday, Sept. 22, 2013. (AP Photo/Aaron Kehoe)

Cleveland Browns Hall of Fame running back Jim Brown, center, walking with his wife Monique, waves before being honored during an NFL football game between the Buffalo Bills and the Cleveland Browns Thursday, Oct. 3, 2013, in Cleveland. Browns owner Jimmy Haslam, right, watches. (AP Photo/Tony Dejak)

Cleveland Browns Hall of Fame running back Jim Brown acknowledges the crowd after being honored at halftime of an NFL football game between the Browns and the Buffalo Bills on Thursday, Oct. 3, 2013, in Cleveland. (AP Photo/David Richard)

Cleveland Browns Hall of Fame running back Jim Brown, third from right, and his wife Monique Brown, back center, pose for a photo with their family, Cleveland Mayor Frank Jackson, left, and Cleveland Browns owner Jimmy Haslam, third from left, during a halftime ceremony of an NFL football game Thursday, Oct. 3, 2013, in Cleveland. The Cleveland Browns defeated the Buffalo Bills 37-24. (AP Photo/David Richard)

Hall of Fame inductee and former Dallas Cowboys player Larry Allen acknowledges cheers from fans as he stands by his HOF bust, right, on the field during a ceremony at half of an NFL football game against the Washington Redskins where Allen was honored, Sunday, Oct. 13, 2013, in Arlington, Texas. (AP Photo/LM Otero)

Former Dallas Cowboys player and Hall of Fame inductee Larry Allen, second from left, reaches up to touch his own bust as team owner Jerry Jones, third from left, does the same during a ceremony at half time of an NFL football game against the Washington Redskins, Sunday, Oct. 13, 2013, in Arlington, Texas. Team president Stephen Jones, and HOF representative Steve Perry, second from right along with Charlotte Jones, right, watch. (AP Photo/Sharon Ellman)

Former New York Jets defensive tackle Marty Lyons holds his nearly one year-old granddaughter Liv Lyons during a halftime ceremony in an NFL football game between the New York Jets and the Pittsburgh Steelers Sunday, Oct. 13, 2013, in East Rutherford, N.J. Lyons was inducted into the Jets Ring of Honor. (AP Photo/Kathy Willens)

Former New York Jets defensive tackle Marty Lyons gestures toward the crowd speaking as he is inducted into the Jets Ring of Honor during a halftime ceremony of an NFL football game between the New York Jets and the Pittsburgh Steelers Sunday, Oct. 13, 2013, in East Rutherford, N.J. (AP Photo/Kathy Willens)