Robbie Henshaw will miss the rest of the Six Nations after suffering a shoulder injury Saturday during Ireland's 56-19 victory over Italy.
Henshaw, 24, appeared to dislocate his shoulder as he scored his second try of the comfortable win in Dublin, the Leinster back leaving the field with his injured right arm in a sling.
Coach Joe Schmidt had hoped there would be good news about the center, but scans Monday confirmed that Henshaw would need an operation.
He already has had the surgery to correct the problem that means he'll play no further part in the tournament.
There was better news regarding Tadhg Furlong, though, after he limped out of the Italy win.
Scans on the forward showed he had only suffered a "minor hamstring injury" and Ireland expect him to be fit to face Wales on Feb. 24 at the Aviva Stadium.