Oliver arrived at the Greater Western Sydney Giants from Melbourne in the trade period before the 2026 season, having won four Demons best and fairests, three All-Australian blazers, two AFL Coaches Association player of the year awards and the 2021 premiership. Drafted at pick 4 in 2015, the 189cm clearance specialist took the first of those best and fairests in his second season. He has played 228 AFL games and kicked 62 goals.