The length of recovery time could rule the 28-year-old out for the rest of the current Magners League season, although Munster hope will he be fit enough to return in time for the end-of-season play offs.
Leamy sustained the injury in the last play of the 37-14 victory over the French Champions, in a move that led to Doug Howlett scoring what could be a vital bonus-point try.
The news is a big blow for the reigning Magners League Champions, with the Ireland back row star having played in six of their Magners League games so far this season.
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