Garry Ringrose will miss Ireland's Guinness Six Nations showdown against France next Saturday after breaking his jaw in today’s 50-17 win over Italy.
The Leinster centre collided with Italy out-half Paolo Garbisi while trying to block a kick in the 27th minute and was removed for a HIA.
Head coach Andy Farrell confirmed afterwards that Ringrose would be out for four to six weeks.
He reported a clean bill of health for the rest of the team.
"Unfortunately, Garry Ringrose broke his jaw," Farrell told RTÉ Sport.
"We're gutted for him. He's contributed so much to the last 10 days.
"He's been fantastic with his leadership and he's a big part of the reason why we [beat] Italy today. I think it will be four to six weeks."
Ireland can win the championship with a bonus-point win over France.