Andrew Porter will miss Leinster's Champions Cup last 16 clashes with Connacht - and Jordan Larmour is also in danger of missing out.
Porter has undergone ankle surgery after he was injured in Ireland's Six Nations victory over Italy and Leinster have confirmed that he will be out for up to eight weeks.
Larmour's hip injury that he sustained in last Saturday's URC victory over Benetton will see the winger miss next Saturday's clash with Ulster at Kingspan Park, and the Blues have stated that he will "also be out for a number of weeks".
Leinster meet Connacht in the first leg of their Champions Cup tie at the Sportsground on Friday, April 8. with the second leg following seven days later at the Aviva Stadium.
Meanwhile Harry Byrne's third start in as many weeks ended prematurely in Parma last weekend as the outhalf, who lined out at inside centre in those three fixtures, suffered a rib injury.
He will be further assessed before it is decided if he will be available for the Ulster clash.
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