SAINTS have signed Willie Manu on a two-year contract from 2013.
The powerful back rower will join from Hull FC where he has spent the last six seasons.
“Willie is one of the best back row forwards in Rugby League and will introduce a new dimension to our game,” said Saints Chairman Eamonn McManus.
“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, 32, joined Hull from Castleford in 2007 and was their Player of the Year in 2011.
A Tongan international, he has also played for Wests Tigers, South Sydney Rabbithos and St George-Illawarra in the NRL and will be part of the Exiles squad that will face England at Langtree Park this Saturday.
Eamonn added: “I’d like to go 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.”