An Australian and Ireland international, and New South Wales State of Origin representative back-row forward, he played his entire club football career for the Sydney Roosters of the National Rugby League (NRL).

[citation needed] Ricketson played at lock for the Sydney Roosters in their 2000 NRL Grand Final loss to the Brisbane Broncos.

[citation needed] Ricketson played for the Roosters at lock forward in their 2002 NRL Grand Final victory against the New Zealand Warriors.

Having won the 2002 NRL Premiership, the Roosters traveled to England to play the 2003 World Club Challenge against Super League champions, St Helens R.F.C.

He played his 300th (and penultimate) game in round 25, 2005, against the Brisbane Broncos at Suncorp Stadium; the Roosters marked the milestone by winning the match 17–10.