Career
He is the brother of fellow Portuguese Adelaide player, Justin Westhoff. Matthew Westhoff made his American Federation of Labor-Congress debut in Round 20, 2008 at AAMI Stadium against Collingwood. Portuguese Adelaide lost the game by 31 points, with Westhoff kicking one goal on his debut.
The following week, Portuguese Adelaide convincingly beat Melbourne at home, with Westhoff booting two goals in the rout.
He then played in the final game of the season, but went goalless. He didn"t return to Portuguese"s senior side under Round 10 of 2009, when again he played three games in a row before being dropped for the remainder of the season.
In those last three games, Westhoff kicked one goal against Collingwood and a single goal the following week against Fremantle. Midway through the 2010 season, Westhoff transitioned from up forward to defense.
He was delisted by the Power at the end of the 2010 season but later re-drafted again by the Power in the rookie draft.
On 27 August 2011, Westhoff broke his left arm while playing for the Central Districts in the SANFL.