17 NFL players to come out of retirement

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

Bronco Nagurski

William Mancebo/Getty Images

From 1930 to 1937, two-way star, a bruising running back and fearsome defensive tackle, led Chicago to two championships. After taking five seasons off, he returned to the Bears. During the 1943 NFL title game, Nagurski scored a touchdown. Chicago won 41-21 and Nagurski retired on top.

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