Nfl

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In this Jan. 12, 2003, file photo, Tampa Bay Buccaneers' Warren Sapp tries to get the crowd going during the third quarter of the NFC divisional NFL football playoff game against the San Francisco 49ers in Tampa, Fla. Sapp is donating his brain for medical research. Sapp announced on social media Tuesday, June 20, 2017, that his brain will go to the Concussion Legacy Foundation after his death. The 44-year-old said in a statement that he's started to feel the effects of the many hits he took during his 13-year NFL career. (AP Photo/Steve Nesius, File)

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In this Thursday, June 15, 2017, photo, NFL player Jerome Bettis attends a football game in Ramat Hasharon, near Tel Aviv, Israel. Hall of Fame running back Jerome Bettis said Monday that the NFL had taken advantage of its players by not sharing with them all the information it had about the risk of concussions. After viewing an innovation expo in Jerusalem that included a presentation from ElMindA, an Israeli neuro-technology company that is helping the NFL diagnose concussions, Bettis said he was encouraged by the progress but still perplexed about how transparent the league has been over the years. (AP Photo/Tsafrir Abayov)

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Washington Redskins quarterback Kirk Cousins (8) looks on during an NFL football team practice, Wednesday, June 14, 2017, in Ashburn, Va. (AP Photo/Nick Wass)

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Washington Redskins guard Shawn Lauvao (77) looks on next to center Spencer Long (61) during an NFL football team practice, Wednesday, June 14, 2017, in Ashburn, Va. (AP Photo/Nick Wass)

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Washington Redskins quarterback Kirk Cousins (8) runs a drill during an NFL football team practice, Wednesday, June 14, 2017, in Ashburn, Va. (AP Photo/Nick Wass)

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New York Jets' Robby Anderson reaches up to make a catch during NFL football practice, Wednesday, June 14, 2017, in Florham Park, N.J. (AP Photo/Julio Cortez)

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New York Jets' Quincy Enunwa watches NFL football practice, Thursday, June 15, 2017, in Florham Park, N.J. (AP Photo/Julio Cortez)

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Tampa Bay Buccaneers running back Doug Martin (22) runs with a reception during an NFL football minicamp Wednesday, June 14, 2017, in Tampa, Fla. (AP Photo/Chris O'Meara)

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Tampa Bay Buccaneers tight end O.J. Howard (80) works against outside linebacker Lavonte David (54) during an NFL football minicamp Wednesday, June 14, 2017, in Tampa, Fla. (AP Photo/Chris O'Meara)

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Tampa Bay Buccaneers head coach Dirk Koetter watches a drill during an NFL football minicamp Wednesday, June 14, 2017, in Tampa, Fla. (AP Photo/Chris O'Meara)

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Tampa Bay Buccaneers quarterback Jameis Winston (3) throws a pass during NFL football minicamp Wednesday, June 14, 2017, in Tampa, Fla. (AP Photo/Chris O'Meara)

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Tampa Bay Buccaneers wide receiver DeSean Jackson makes a reception during an NFL football minicamp Wednesday, June 14, 2017, in Tampa, Fla. (AP Photo/Chris O'Meara)

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The City of Inglewood holds a special session city council meeting, Thursday June 15, 2017 in Inglewood, Calif. The Inglewood City Council unanimously approved an exclusive negotiating agreement with the Los Angeles Clippers on Thursday that could lead to the construction of an arena for the NBA team across the street from the future home of the NFL's Chargers and Rams.(Robert Casillas/Los Angeles Daily News via AP)