Wales and Scarlets centre Jonathan Davies has agreed to join Clermont Auvergne on a two-year contract with an option of a further 12 months.
Davies has ended speculation about his future and will join the French Top 14 club in July.
The 25-year-old, who has won 37 caps, starred for the British and Irish Lions during their Australia victorious tour earlier this year, playing in all three Tests.
Davies played for Wales in last Saturday's Test match against South Africa, but he suffered a pectoral injury that forced him off early in the game.
Wales have already confirmed that Davies will miss their remaining autumn appointments with Argentina, Tonga and Australia, while he could also be forced to sit out this season's Six Nations if it is decided that he requires surgery.
Davies is the latest Wales star to join the French exodus, following the likes of Clermont full-back Lee Byrne, Perpignan's James Hook and Luke Charteris, plus the Racing Metro pair of Jamie Roberts and Dan Lydiate.
"We can only be delighted to welcome Jonathan," said Clermont sporting director Jean-Marc Lhermet on the club website.
"His profile fits perfectly to the game that we practise.
"Despite his young age, he has a huge experience of high-level matches and is one of the world's best players in his position. He will be an asset to our team.
"Jonathan decided to leave Wales for a new adventure, and we are happy that it is with the 'yellow and blue'.
"In addition to his class, he has determination to help us win new titles in the years to come."
Davies will be fully available to play international rugby after he joins Clermont.
Wales assistant coach Rob Howley confirmed Davies has secured "full release" as part of his two-year contract at Stade Marcel Michelin.
But Howley admits the departure of another star player from Wales is a blow.
Howley said: "He will be sorely missed. What you saw in the summer in terms of his performances for the Lions was exceptional. He has been outstanding on and off the field.
"I am aware he is a very ambitious player. He wants to be part of a winning team, winning medals, and obviously he has gone to a side that he feels is going to be right up there in European rugby.
"We want our players in Wales because ultimately Welsh supporters want to watch the best and we, as coaches, want to watch the best on a Friday and Saturday, as opposed to going over to France or England."