The 24-year old becomes the latest person to enter the revolving door between Belmore and Canberra.
The Raiders are also set to release Papua New Guinea international Kurt Baptise to ease salary cap pressure.
With Adam Clydsdale returning to the nation’s capital, Garvey looks set to battle it out for the second-choice hooker position at Canberra.
Raiders hooker Josh Hodgson announced his four-year contract extension on Monday – one of the biggest in the Raider’s history.
Baptise has rejected lucrative offers from England, however, his future will be sorted out soon.
Garvey has played thirteen matches for the Bulldogs and Dragons across five season.