Leinster Rugby has confirmed today that Irish flanker Sean O'Brien's shoulder injury is set to rule him out for the rest of the season.
The province announced that he had a "procedure on a shoulder injury last Friday." That surgery came after O'Brien endured a second unsuccessful comeback from the injury earlier this month.
The Lions back-row suffered an injury to the joint against the Scarlets on March 9th which has resulted in his enforced absence. It marks a horrendous run of injuries for the 31-year-old who also missed the Six Nations.
The shoulder injury comes after a hip injury that forced him into three months rehab and more surgery last year. He will miss the end of the Pro14 season as well as the Champions Cup final and faces a race to be fit for Ireland's summer tour of Australia.
In more positive news, Robbie Henshaw's return last weekend was without complication while Luke McGrath (ankle) and Rhys Ruddock (hamstring) continue to make good progress.