Aitken made his début for the Melbourne club against St. George Illawarra in round 5 at the start of the 2007 season, coming off the bench as an interchange player.

Following Cameron Smith's controversial suspension after Melbourne's semi-final victory against the Brisbane Broncos, Aitken was selected at hooker to play in the 2008 NRL Grand Final after only a handful of first grade appearances.

During the subsequent off-season, Aitken was released by the Melbourne side and chose to continue his Rugby League career with French club AS Carcassonne.

[citation needed] After a stint in the Illawarra Carlton League with the Helensburgh Tigers in 2011, Aitken once more returned to play in France with his former club AS Carcassonne for the 2011/12, 12/13 and 13/14 seasons.

Aitken has since coached at Central Queensland Capras in the QLD Cup, lower grades at the Cronulla-Sutherland Sharks and most recently at the Helensburgh Tigers in the Illawarra Carlton League.