Harlequins have announced that Australia lock James Horwill will join the Premiership club following the conclusion of the 2015 World Cup.
The 29-year-old will arrive on a three-year deal from Queensland Reds.
Horwill has earned 58 caps for Australia, captaining the Wallabies on 16 occasions, including during the 2011 World Cup and against the British & Irish Lions in 2013.
"This is right for me at this stage of my rugby career," he said.
"As hard as it will be to leave Ballymore, my team-mates, the staff and all my fans and friends in Queensland, I've been offered a fantastic opportunity with Harlequins to experience rugby in another part of the world."
Quins director of rugby Conor O'Shea added: "I'm delighted that we've attracted someone of James' standing in the game to play for us following the completion of the World Cup next year.
"James is known around the world not only for his uncompromising style of play but also for his strength of character. He will be an asset for us on the field and within the changing room."