As NRL Premiers Wests faced Super League champions Bradford Bulls in the 2006 World Club Challenge.

By 2006, Collis was a regular starter in the centres, playing in every game of the 2006 and 2007 seasons, and winning a spot in the City team.

[3] In July, 2009, it was announced that Collis had signed a two-year deal to play with the Cronulla-Sutherland Sharks from the 2010 NRL season.

[4] In September 2011 Collis signed a deal that saw him join the Super League playing for Wakefield Trinity until 2015.

On 11 June 2015 it was announced that Collis would be leaving Wakefield Trinity with immediate effect as he had a desire to return home due to family reasons.