Hull FC have confirmed forward Sam Moa is to join NRL side Sydney Roosters on a two-year deal.
Moa, 26, was ruled out for the rest of the season in July after
undergoing surgery on a bicep injury.
The Tongan made 78 appearances for the Black and Whites after making his debut in 2009.
He told the club website:
"The club and the fans have been great to me, Hull FC gave me an opportunity and I wouldn't be in this position without them."
Moa joined the KC Stadium side from
Cronulla Sharks in Australia in 2009.