A ruck-rover, Treleven was recruited to Hawthorn after an impressive season for East Fremantle in 1995. That season he had won both a Sandover Medal and Simpson Medal, the latter as West Australia's best player in their interstate match against Queensland. Hawthorn acquired his services with pick 16 in the 1996 pre-season draft and he spent five seasons with the club before leaving and returning home to finish his career in the WAFL.
