NFL

FILE - In this Nov. 9, 2009, file photo, NFL commissioner Roger Goodell looks on during an NFL football game between the Pittsburgh Steelers and the Denver Broncos at Invesco Field at Mile High in Denver. Goodell sent a wide-ranging memo about concussions to NFL teams on Tuesday, Nov. 24, 2009, saying the co-chairmen of the league's committee on brain injuries have resigned and that he is examining potential rule changes "to reduce head impacts." A copy of the memo was obtained by The Associated Press.