Denver Broncos running back Willis McGahee (23) is slow to get up after a run against the San Diego Chargers in the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in Denver. McGahee left the game. (AP Photo/Jack Dempsey)

Photo by: Jack Dempsey

Denver Broncos running back Willis McGahee (23) is slow to get up after a run against the San Diego Chargers in the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in Denver. McGahee left the game. (AP Photo/Jack Dempsey)