After spending the first half of the 2012 season recovering from a hip spur operation,[5] he played the remainder of the year in Swan Districts reserves side in the West Australian Football League (WAFL). In 2013 he transferred to Peel Thunder and made his WAFL league debut.[6] Forster was one of ten players brought into the Fremantle side in the final round of the 2013 AFL season against St Kilda at Etihad Stadium, when many senior players were rested ahead of the finals matches.[7]
Delisted by Fremantle at the end of the 2013 season, Forster returned to South Australia and rejoined Norwood.[8]