17 NFL players to come out of retirement

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

Rolando McClain

Otto Greule Jr/Getty Images

On May 15 2012, McClain announced his retirement at the age of 23, having never played a down for the Ravens. On July 1, 2014, after linebacker Sean Lee was lost for the season, the Dallas Cowboys acquired McClain along with a seventh-round pick from the Baltimore Ravens, in exchange for a sixth-round pick in the 2015 NFL Draft.

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