He previously played for the New Zealand Warriors in the NRL, and for the Bradford Bulls and the Widnes Vikings in the Super League.

Ah Van also spent time on loan from Widnes at North Wales in the third tier.

Educated at Kelston Boys' High School, Ah Van played for New Lynn Stags and Te Atatu Roosters in the Auckland Rugby League competition before playing for the Mount Albert Lions in the Bartercard Cup.

In 2008, his third year at the club, Ah Van was still young enough to be eligible for the Toyota Cup team, and made thirteen appearances for the Junior Warriors, scoring six tries.

[7] It was announced on 31 August 2010 that Ah Van had been released from the last year of his Warriors contract so he could sign a one-year deal with Bradford for the 2011 season.

Ah Van featured in all the games that season except for Round 10 against Salford, he scored 12 tries and kicked 97 goals for a total of 242 points.

It was announced on 2 August 2011 that Ah Van had signed a two-year contract with Widnes for the 2012 and 2013 seasons.

[8] In 2019–20, Ah Van played four games for rugby union club Sale FC.

[11] Anselmians RUFC In September 2023, Patrick Ah Van joined Rugby Union club Anselmians RUFC [1] who are playing their inaugural season (2023/24) at Tier 5, of the English rugby pyramid, in Regional 1 North West .

Anselmians [2] are based in Eastham on The Wirral Peninsula On 16 November 2023 it was reported that he had signed for North Wales Crusaders in the RFL League 1 for the 2024 season.