Harlequins stalwart Will Collier is set to leave the club after 13 seasons in order to move into the top 14.
The 33-year-old England international has made 241 appearances for Quins since making his debut in 2011, winning two Premier League titles along the way.
The London club did not reveal its next destination, but it was heavily linked with a move to Castres, who are likely to lose their star player Henry Thomas at the end of the season.
Rugby Pass It was reported that Queens were eyeing Samoa and former USA support Titi Lamousitil as Collier's successor in Stoop.
Collier started in Quins' 58-26 loss to Exeter Chiefs at the weekend, and is certain to feature on Saturday at Stoop against the Bristol Bears in what will be his final home performance.
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A win over the Bears could extend Collier's Quins' career, as they will be in contention to make the top four in the Gallagher Premiership.
“Having been part of Harlequins since I was 14, I've been lucky enough to call Stoop home for almost 20 years,” Collier said after announcing his departure.
“I have been a fan of this club all my life and playing here has been a dream come true. Some of my greatest friends and memories have come from my time at Quins.
“It was a difficult decision to leave but now I feel like the time is right to take on a new challenge and adventure in France.
“To our amazing fans, staff, coaches, and all the players I took the field with, I want to say thank you so much. It's been quite a ride. I'm looking forward to an exciting end to our season. Quick!”
Harlequins scrum coach Adam Jones added: “Cole has been a key member of our team for the past 13 years. He is a true Harlequin and has made a huge contribution on and off the field.
“I am sad to see Cole go but we support and understand his desire to take on a new challenge. We wish Cole, his wife Kate and their two children every success, and I know he will embrace the lifestyle and make a huge impact on the pitch, and we thank him for his outstanding service to our club.
