Samoa scrum-half Kahn Fotuali'i is to leave the Ospreys after signing for Aviva Premiership side Northampton.
Fotuali'i joined the Ospreys following the 2011 Rugby World Cup and has made a substantial impact in the region, putting in a string of impressive performances that have caught the eye of clubs both in England and France.
The 30-year-old scrum-half, capped 13 times by Samoa, has won rave reviews for his recent performances in the Heineken Cup and is regarded by many commentators to be the best player in his position in world rugby.
The 6ft, 94kg Fotuali'i joins the Saints from the Ospreys. In his two seasons at the Liberty Stadium he has played 39 times, including in the PRO12 final success over Leinster and earning the man of the match award in the recent Heineken Cup game against Leicester.
Born in Auckland, Fotuali'i had been tipped for full All Blacks honours after making his mark in Super Rugby for the Crusaders, for whom he played 28 times. Instead Fotuali'i chose to represent Samoa, and after a man of the match performance in his 2010 debut he went on to play in the 2011 Rugby World Cup.
Fotuali'i has experience of playing both 9 and 10 at international and provincial level.
"Kahn is a player who has attracted a lot of positive headlines and attention throughout his career," said director of rugby Jim Mallinder.
"He has a superb set of skills and is a powerful and dynamic runner who will add to our options in one of the team's crucial positions.
"We're delighted that he has chosen to sign a long-term contract to play his rugby at Franklin's Gardens, and we're looking forward to welcoming him to the club in the summer."