[1] Westhoff made his AFL debut in Round 20, 2008 at AAMI Stadium against Collingwood.
[1] Port Adelaide lost the game by 31 points, with Westhoff kicking one goal on his debut.
The following week, Port Adelaide convincingly beat Melbourne at home, with Westhoff booting two goals in the rout.
Midway through the 2010 season, Westhoff moved from forward to defence in the SANFL, but did not play any senior games.
On 27 August 2011, Westhoff broke his left arm while playing for the Central Districts in the SANFL, and Port again delisted him at the end of 2011.