sentences:  After failing to play a senior game in his one season at Fremantle, Gumbleton announced his retirement in September 2014.He returned to Melbourne to play for the Banyule Football Club in the Northern Football League from 2015.Gumbleton, along with 33 other Essendon players, was found guilty of using a banned performance enhancing substance, thymosin beta-4, as part of Essendon's sports supplements program during the 2012 season.