A very tall tap ruckman, at a height of 206 cm, Warnock played TAC Cup football for the Sandringham Dragons.

Warnock played the entire 2006 season with his assigned WAFL club, West Perth.

He played only two of the first ten games as Fremantle preferred to select Daniel Gilmore, Michael Johnson or Kepler Bradley ahead of Warnock as Aaron Sandilands' ruck partner.

[3] Warnock returned to the team for the second half of the year but a shoulder reconstruction ended his season premature.

He was subsequently struck down by stress fractures in his foot during his first pre-season with Carlton, and missed the majority of 2009.

He eventually played a handful of games with Carlton's VFL-affiliate, the Northern Bullants, late in the season, but did not make his debut for the Blues.