Wales back Liam Williams will leave Scarlets to join European and Premiership champions Saracens at the end of the season.
It was reported last November that Williams, who can operate on the wing or at full-back, was expected to make the move to London.
Sarries on Monday confirmed that the 25-year-old has signed a three-year deal, meaning he will have to rely on one of three wildcard selections to feature for his country as of next season given he will be plying his trade outside Wales.
Williams said: "I am really excited about joining Saracens and having the opportunity to challenge myself in the Aviva Premiership.
"The club's reputation speaks for itself and I am looking forward to the next chapter of my career. I wouldn't be the player I am without the incredible support from the Scarlets' management, players, back-room staff and passionate supporters.
"I will be giving my all for the remainder of the season and hope to help finish on a high."
Saracens director of rugby Mark McCall expects Williams, capped 38 times by Wales since making his debut five years ago, to make a big impact at Allianz Park.
"Liam's arrival at Allianz Park next season is fantastic news," said McCall.
"He is only 25-years old and has his best years of rugby ahead of him. Liam is arguably one of the most talented backs in Europe so to have secured his signing is real coup for the club.
"We'll look forward to welcoming him in the summer."
"Liam is arguably one of the most talented backs in Europe so to have secured his signing is real coup for the Club." - Mark McCall pic.twitter.com/QBLuouQKe7-- Saracens Rugby Club (@Saracens) January 9, 2017