Video: Here is the moment that forced Sean O'Brien off against France
Ireland suffered a big blow at the mid-point of the half when Sean O'Brien crumpled to the ground after trying to step off his right leg.
He was replaced by Tommy O'Donnell having suffered a suspected knee injury which could put his participation in the remainder of the Six Nations in doubt.
Sean O'Brien prone on the pitch, looks bad— Rúaidhrí O'Connor (@RuaidhriOC) February 13, 2016
Sean O'Brien leaves pitch with injury...seen & heard this way too many times before...Pity #IREvFRA— Mick O'Keeffe (@okmick) February 13, 2016
Sean O'Brien is another who has been terribly unlucky with injuries. Get well soon Sean.— Ruck 'n' Roll (@RnRRugby) February 13, 2016
Sean O'Brien going off injured will be a big blow to Ireland. They have lost their key ball carrier now. #BBCSixNations— Andrew Priestley (@A_Priestley89) February 13, 2016