17 NFL players to come out of retirement

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

Deion Sanders

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After taking three seasons off, Deion Sanders returned to the field in 2004 and didn’t have much rust to shake off. Over two seasons with the Ravens, the best cornerback ever picked off five passes. He retired for good after the 2005 season when he was 38.