Worcester centre Josh Matavesi will join the Ospreys in the summer.
Matavesi joined the Warriors in 2012 and has played 38 times but his contract ends at the end of the season and he has opted to move to south Wales.
Warriors director of rugby Dean Ryan told the club's website: "Josh has been an asset to the Warriors during his time at the club and I know he will remain focused on the task here for the rest of the season. We wish him every success at the Ospreys."
Matavesi added: "I've got half a season left at Worcester and there's a big job still to be done. That is my sole focus between now and May, before I can even look at the future and the Ospreys."