[3] On 17 April, Westhoff was controversially suspended for two games for high contact on North Adelaide captain Darryl Wintle during Central District's 7-goal defeat of the Roosters in Round 1 of the SANFL.

On 3 June, Westhoff's consistent goalkicking dominance at local level saw him make his AFL debut for Port Adelaide against Hawthorn.

Westhoff was also reported for charging the Hawks' Clinton Young in the last quarter; however, this was later dismissed by the match review panel, as they deemed the contact unintentional and unavoidable.

[4] Westhoff had his career-best game against the West Coast Eagles in round 15, on 14 July, kicking four goals, including two from contested marks on eventual All-Australian full back Darren Glass.

Westhoff's strong season ended up with him finishing 4th in the 2007 AFL Rising Star competition, garnering a total of 10 votes.

He was also recognised with the Gavin Wanganeen Medal and the Best First-Year Player award at the Power's club champion venue.

His opponent on the day, Matthew Scarlett, had 30 possessions, while Westhoff was unable to have any impact on the game, frequently being pushed off in contests due to his slight stature.

At one stage, Westhoff was also dropped from the Power's lineup in the round 13 game against the Richmond Tigers due to poor form.

He returned in round 11 after a late withdrawal from Robert Gray, and despite not having played any games since the injury, still managed to kick two goals as well as 16 disposals (including 10 marks).

[7] The 2013 season saw Westhoff play as a Centre half-forward but also drop into defence when required by newly appointed coach Ken Hinkley.

He was a key player in Port's win over Collingwood, with an absolutely dominant first half, and was best on ground against Fremantle in the final game of the season.

Season 2018 saw him play multiple roles such as a pinch-hitter in the ruck, a safe marker in defence, and swingman on the wing.