Croston, 26, was originally signed by the Patriots as a rookie free agent out of Iowa on May 5, 2017. The 6-foot-5, 310-pounder made the 53-man roster out of training camp as a rookie and appeared in three regular-season games and the AFC Championship Game. Croston began the 2018 regular season on the New England practice squad and was added to the 53-man roster on Sept. 15. He appeared in two games as a reserve before being released on Nov. 6. He re-joined the Patriots practice squad on Nov. 8, where he remained for the rest of the season.