The former Ireland and Lions second row says he's leaving to get more game.
The two time European cup winner was contracted until the end of this season but has been allowed to leave early by Munster and the IRFU.
Tipperarys Alan Quinlan outlines what makes his former teammate so good.
Meanwhile Ireland coach Joe Schmidt will name his side just before two o'clock today for the final World cup warm up match with England at Twickenham.
A near full strength starting fifteen is expected to start on Saturday.
