FILE - Denver Broncos guard John Moffitt plays against the Arizona Cardinals  during a pre-season NFL football game on Thursday, Aug. 29, 2013, in Denver. Moffitt says he quit the NFL this week not because he was unhappy with a lack of playing time in Denver but because he'd lost his love for the game and was tired of risking his health. The Broncos put him on their reserve/left team list on Tuesday Nov. 5, 2013 when they activated center J.D. Walton from the physically unable to perform list. (AP Photo/Jack Dempsey, File)

Photo by: JACK DEMPSEY

FILE - Denver Broncos guard John Moffitt plays against the Arizona Cardinals during a pre-season NFL football game on Thursday, Aug. 29, 2013, in Denver. Moffitt says he quit the NFL this week not because he was unhappy with a lack of playing time in Denver but because he'd lost his love for the game and was tired of risking his health. The Broncos put him on their reserve/left team list on Tuesday Nov. 5, 2013 when they activated center J.D. Walton from the physically unable to perform list. (AP Photo/Jack Dempsey, File)