Worcester's Blair Cowan will join the club's Premiership rivals London Irish at the end of the season.
The back row forward has agreed a three-year contract and will leave Sixways in the summer after 18 months.
Cowan, new Zealand-born but now English qualified, said: "I'm looking forward to moving down south and joining London Irish.
"There are a lot of great players at the club and a lot of potential to match. I would like to thank Worcester Warriors and wish them all the best for the future."
London Irish Director of Rugby, Brian Smith said: "Blair Cowan is in great form at present and he's a player we've been tracking for some time.
"Blair is a great fit for us, he can play all three back row positions and he's a try scorer. There are a lot of tough players in this league but not a lot tougher than this guy."