St Helens have announced the signing of Hull second rower Willie Manu on a two-year contract.
The 32-year-old will move to Saints at the end of the current Stobart Super League season having turned down the offer of a new deal from his current employers.
Manu - a Tonga international who is part of the Exiles' squad to face England on Saturday - becomes the first signing by Nathan Brown, who takes over as head coach at Saints from November.
He has missed only three matches in the last three seasons for the Black and Whites having arrived at the KC Stadium from Castleford.
"Willie is one of the best back-row forwards in rugby league and will introduce a new dimension to our game," said St Helens chairman Eamonn McManus.
"He is a devastating runner with a phenomenal workrate 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 has played for Wests Tigers, South Sydney and St George Illawarra in the NRL and was briefly a member of England coach Steve McNamara's training squad in 2010 after qualifying through residency.
The strong-running forward was Hull's player of the year in 2011 but, after rejecting their final offer, was given permission to talk to other clubs.
McManus added: "I would like thank Hull FC for allowing us permission to speak to Willie and express my appreciation for the way the club has conducted itself during the negotiations."
Manu may not be the last Hull player to pitch up at Langtree Park in 2013 - former Salford centre Jordan Turner, who is also out of contract at the KC Stadium at the end of the year, has been linked with Saints.