But after being released by Cardiff Blues Powell, who will link up with Wales and Wasps coach Shaun Edwards, has signed a one-year deal at Adams Park.
Powell, who has won 14 caps, said: "I am extremely excited to be joining London Wasps. My decision was a pure rugby decision.
"After all the talk and speculation about where I will be playing, all I want to do now is get my head down, improve as a player and hopefully if selected, play in the World Cup next year for my country.
"To do that I need to be playing well for my club, and I think with the coaching team and setup here at Wasps, I will have the perfect opportunity to do that.
"I know Shaun well of course from my time with the Welsh team, and I took little persuading once I met with Tony Hanks and Trevor Woodman about how serious this team is about success and winning."