Canadian winger DTH van der Merwe will leave Glasgow at the end of the season to join Guinness Pro12 rivals the Scarlets.
The club's leading try scorer will bring to an end a six-year spell in Glasgow when he moves to the Welsh region.
The 28-year-old has scored 39 tries in 90 appearances for the Warriors and has 28 caps and nine tries for Canada.
"I am extremely grateful to Glasgow Warriors for all that they have done for me since I joined back in 2009," van der Merwe told the Warriors official website.
"I have had six great seasons at Glasgow but I feel that the time is right for me to face a new challenge.
"We have some big games coming up between now and the end of the season and after missing the second part of last season, including the final through injury, I'm hoping I can play my part this time around.
"I have heard great things about the Scarlets and the facilities at Parc y Scarlets and I'm looking forward to making the move to West Wales.
"The Scarlets are traditionally known for their exhilarating style of running rugby and have some great backs in the likes of Regan King and Scott Williams and it will be great to link up with former international Stephen Jones who'll be making a return as a backs coach."
Scarlets Head Coach Wayne Pivac said: "We are delighted to announce that DTH will join us here at Parc y Scarlets ahead of the new season. His record speaks for itself – he's a very aggressive defender, has a natural ability to create and score tries and having a strong finisher in your side is invaluable.
"At 28 years of age DTH will add international experience and maturity to our relative young backline and it will be great to have another experienced voice around to nurture some of our younger guys coming through.
"With experience at centre and on the wing DTH will be an exciting new addition to the squad."