Jacksonville signed Rivera to a one-year deal with a team option for a second year in March. He spent his only season with the Jaguars on injured reserve with a hand injury.
Benn, 29, went on injured reserve in November with a knee injury. He played in nine games, making one catch for 12 yards, but he did serve as a special teams captain.
He has had an injury-plagued career, missing 67 games and playing 61 during his eight seasons.