Leinster second-row Kane Douglas has been ruled out for the rest of the season with a back injury, coach Matt O'Connor confirmed on Thursday.
The Australian forward and former Waratahs powerhouse will be sidelined for the next three months and is set to undergo surgery to correct the issue.
"It initially started out as a hamstring problem and we thought we could get through it and manage but we now know that Kane has got a significant disc issue in his back that will require surgery," O'Connor told Leinster's official website ahead of Sunday's Champions Cup semi-final with Toulon.
"He saw a specialist earlier this week and they're booking in with our medical team a slot for surgery. I think it's about three months. It's a pretty standard procedure and fingers crossed he should be good as gold in that timeframe."
O'Connor also confirmed that a decision on the fitness of Shane Jennings wouldn't be made until later in the week, but that the rest of the squad was fit.
"We've had a good couple of day's preparation. The guys are very excited about the challenge, obviously. We're fit and raring to go," he added.