17 NFL players to come out of retirement

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

Brett Favre

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Brett Favre announced his retirement in the winter of 2008, but the arrangement didn’t last long. That summer, the Jets traded for the future Hall of Fame quarterback. Favre spent a season with New York and then played two more for the Vikings, who he led to the ’09 NFC title game.