Wasps can confirm that Guy Thompson will leave the club when his current contract expires at the end of the season.
The back-rower has agreed a move to Leicester Tigers for the start of the 2018/19 season.
“Leaving Wasps is the hardest decision I’ve had to make," said Thompson.
“It’s been my home for five seasons and I can’t thank Dai and the coaching staff enough for the opportunities they have given me...
“Leicester is a club with so much success and prestige – and a history of great opensides like Neil Back and Lewis Moody that I grew up watching play for England – and when the opportunity came along, it was one I couldn't turn down.
“Playing at Welford Road has been one of my favourite away venues. It's loud, it's fierce and the crowd are right there for every hit. I'm looking forward to running out there as a home player.”
Director of rugby Dai Young added: “We’re sorry to see Guy leave.
“I have no doubt he will remain a fully-committed member of the squad until the end of the season and continue to play his part to the full.
“When the moment is right in May we’ll say our goodbyes more fully. In the meantime, on behalf of everyone at Wasps I’d like to thank Guy for his efforts and wish him well.”
The 31-year-old back-rower has appeared 90 times since joining Wasps from Jersey in 2013 and has scored 24 tries.