St Helens have signed Willie Manu for 2013.
Manu, who will face England for the Exiles on Saturday, will arrive at Langtree Park on a two year contract.
Saints chairman Eamonn McManus said: “Willie is one of the best back row forwards in rugby league and will introduce a new dimension to our game.
“He is a devastating runner with a phenomenal work rate and is one of the league’s top tackle bust makers. He is also a great defender too and we look forward to welcoming him next season.”
Manu joined Hull FC from Castleford in 2007. The Tongan international has played for West Tigers, South Sydney Rabbitohs and St George Illawarra Dragons before continuing his career in the UK.