Wales international prop Rhodri Jones will join Ospreys from Scarlets at the end of the season.
The 24-year-old has played in 13 internationals and signed a national contract in December 2014.
The tight-head made his 100th appearance for the Scarlets in the win over Edinburgh on Friday, 12 February.
“We are disappointed to see Rhodri leave the Scarlets however we respect his decision,” said Scarlets general manager Jon Daniels.
Jones said: “It was an honour to have played my 100th game for the Scarlets last weekend and I will give my all to the region as we challenge for a Pro12 play-off position from now until the end of the season.
“I’ve enjoyed my time at the Scarlets and would like to thank everyone for their help and support during my time here.”
Jones’ chances have been limited at the region and the national team by the emergence of Samson Lee, who has established himself as Warren Gatland’s first-choice tight-head.
His opportunities with Wales have also been limited by Exeter’s Tomas Francis, who was selected for the World Cup squad and has made two appearances off the bench during the 2016 Six Nations Championship.