Nfl

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Oakland Raiders quarterback Derek Carr fumbles his a snap during the team's NFL football rookie camp on Friday, May 16, 2014, in Alameda, Calif. (AP Photo/Marcio Jose Sanchez)

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Minnesota Vikings quarterback Teddy Bridgewater (5) talks with running back Jerick McKinnon, left, during the NFL football team's minicamp in Eden Prairie, Minn., Friday, May 16, 2014. New Vikings coach Mike Zimmer set to work getting young players like Bridgewater, linebacker Anthony Barr and defensive backs Antone Exum and Kendall James up to speed on what will be expected of them in the NFL. (AP Photo/Ann Heisenfelt)

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Minnesota Vikings coach Mike Zimmer talks with defensive end Scott Crichton during the NFL football team's minicamp in Eden Prairie, Minn., Friday, May 16, 2014. Zimmer set to work getting young players like quarterback Teddy Bridgewater, linebacker Anthony Barr and defensive backs Antone Exum and Kendall James up to speed on what will be expected of them in the NFL. (AP Photo/Ann Heisenfelt)

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FILE - In this May 13, 2014 file photo, St. Louis Rams seventh-round draft pick Michael Sam listens to a question during a news conference at the NFL football team's practice facility in St. Louis. When Sam was drafted by the St. Louis Rams on May 10, 2014, he became the first openly gay player ever drafted by an NFL team. It is a milestone has made longtime gay fans all the more enthusiastic, and already is drawing newcomers into the fold. (AP Photo/Jeff Roberson, File)