James Tedesco's departure from the Wests Tigers to join the Sydney Roosters has been confirmed, with the NSW Origin fullback signing a four-year deal from next year.

Tedesco's future was subject to much speculation in recent weeks when the Tigers withdrew a contract extension offer after he failed to sign before a deadline.

The 24-year-old has played 78 games in six seasons at the Tigers, making his State of Origin debut in game three last year.

Tedesco, the Dally M fullback of the year in 2016, is a likely replacement for veteran Michael Gordon, with the 33-year-old on a one-year deal and possibly set for retirement.

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"James is a tremendously exciting talent whose signature we are pleased to have secured and we look forward to welcoming him to the Roosters in 2018," Rooster chief executive Joe Kelly in a statement.

Confirmation of the 24-year-old Tedesco's departure means the Tigers have failed to keep three of their biggest off-contract stars, with captain Aaron Woods (Canterbury) and five-eighth Mitchell Moses (Parramatta) also to exit.

Halfback Luke Brooks signed a two-year contract extension last month.

- AAP