17 NFL players to come out of retirement

Rob Gronkowski will return as a Tampa Bay Buc, becoming another player who returned after retiring.

Ricky Williams

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Ricky Williams actually missed two seasons of his prime. He retired after the 2003 season and after returning for the 2005 season, got suspended and missed all of 2006. Still, the running back returned in 2007 and went on to play five more seasons. In 2009, Williams rushed for 1,121 yards and 11 touchdowns.

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