Grey continued to play for Peel throughout 2015, and made his AFL debut for Fremantle in the final round of the 2015 AFL season, when Fremantle sent a weakened team to play Port Adelaide at Adelaide Oval. Twelve changes were made to the team, and Grey was one of four players to make their AFL debuts.[2] He was delisted at the conclusion of the 2016 season,[3] before he was subsequently re-drafted by Fremantle in the 2017 rookie draft. He played 14 games for Fremantle in 2017, but only four more in 2018 before being delisted again at the end of the season.[4]