Carolina Panthers

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Carolina Panthers' Bruce Campbell (73) is shown during an NFL football training camp practice in Spartanburg, S.C., Saturday, July 27, 2013. (AP Photo/Chuck Burton)

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Cleveland Browns guard Shawn Lauvao in an NFL football game against the Carolina Panthers Sunday, Nov. 28, 2010, in Cleveland. (AP Photo/Tony Dejak)

Carolina Panthers' Captain Munnerlyn (41) celebrates his interception return for a touchdown against the New York Jets during the second half of an NFL football game in Charlotte, N.C., Sunday, Dec. 15, 2013. (AP Photo/Bob Leverone)

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Carolina Panthers' Captain Munnerlyn (41) looks to the end zone crowd as he runs his interception against the New York Jets into the end zone during the second half of an NFL football game in Charlotte, N.C., Sunday, Dec. 15, 2013. The Panthers won 30-20. (AP Photo/Bob Leverone)

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Carolina Panthers' Mike Mitchell (21) yells in celebration to fans in the stands after helping to beat the New England Patriots 24-20 following an NFL football game in Charlotte, N.C., Monday, Nov. 18, 2013. (AP Photo/Bob Leverone)

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FILE - In this Dec. 15, 2013 file photo, Carolina Panthers' Graham Gano (9) kicks a field goal against the New York Jets during the first half of an NFL football game in Charlotte, N.C. Holding the ball is punter Brad Nortman. Gano is the first of Carolina's 20 soon-to-be unrestricted free agents to re-sign with the Panthers. Carolina announced Friday, Feb. 28, 2014, that Gano agreed to a four-year contract. (AP Photo/Bob Leverone)

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FILE - In this Sept. 16, 2012 file photo, Carolina Panthers left tackle Jordan Gross (69) keeps New Orleans Saints' Will Smith (91) blocked as Panthers quarterback Cam Newton (1) looks for a receiver during the first half of an NFL game in Charlotte, N.C. The Panthers will have to find someone new to protect Newton's blindside following the retirement of Gross. (AP Photo/Bob Leverone, File)

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FILe - In this Dec. 1, 2013 file photo, Carolina Panthers tackle Jordan Gross (69) runs onto the field during player introductions prior to an NFL football game against the Tampa Bay Buccaneers in Charlotte, N.C. The Panthers say that Gross will announce his retirement at a news conference on Wednesday, Feb. 25, 2014. (AP Photo/Mike McCarn, File)