Career
He primarily plays at centre. Collis played his junior football with the Campbelltown Warriors. Making his debut with Wests Tigers in 2003, Collis played 8 games until the end of the 2005 season.
As NRL Premiers Wests faced Super League champions Bradford Bulls in the 2006 World Club Challenge.
Collis played at centre in the Tigers" 30-10 loss. 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
His remaining 2 seasons with Wests Tigers were hampered by injury. In July, 2009, it was announced that Collis had signed a two year deal to play with the Cronulla Sharks from the 2010 season.
In September 2011 Collis signed a deal that will see him join the European Super League playing for Wakefield Trinity until 2015.
On the 11th of June 2015 it was announced the Dean would be leaving Wakefield Trinity Wildcats with immediate effect as he had a desire to return home due to family reasons. First Grade Debut: 2003, Round 25 - Wests Tigers v North Queensland Cowboys, Campbelltown Stadium, 31 August
50th First Grade game: Round 19, 22 July 2007, scoring a try in the seventh minute.
