Worcester Warriors have signed Ireland international lock Donncha O'Callaghan from Munster.
The 36-year-old, who has made 94 appearances for his country since 2003, leaves Munster following a 17-season spell with the Pro12 club.
"I'm very grateful to Munster for all that they've done for me but now I'm hungry for my new challenge," he told Worcester's official website.
"The developments and structures in place at Warriors are very exciting but also the quality of management and the players at the club are something I cannot wait to be a part of."
O'Callaghan represented the British and Irish Lions four times on their 2005 and 2009 tours respectively.