A hamstring strain sustained by Paddy Jackson in training coupled with Jonathan Sexton's injury absence could see Leinster's Ian Madigan start at fly-half at the Aviva Stadium, forcing coach Declan Kidney to recall O'Gara after omitting him from the squad on Sunday.
Kidney's decision had appeared to signal the end of O'Gara's international career after a record 128 appearances for Ireland, but he is now prepared to make a U-turn.
"Absolutely not would I mind asking Ronan back, I'd be delighted. There was no fun whatsoever in leaving him out," Kidney said.
"I'm sure he'd love to play for Ireland, he's always loved playing for Ireland and he'd continue to do that."
Declan Kidney
"I'd only be too delighted. It wouldn't be an awkward conversation from my side, absolutely not.
Disappointed
"I'm sure he'd love to play for Ireland, he's always loved playing for Ireland and he'd continue to do that.
"Ronan will have been disappointed. You don't give the type of service that Ronan has given and not be disappointed.
"It's the role of the coach to make these calls and I felt Ian had been going well and deserved his chance.
"But it's unfair to put Ronan in that spotlight. Everybody is centrally contracted, so everyone is available to play for Ireland at any stage.
"We have 20 guys on standby. We'd call someone in when need be. Everyone is alerted."
Source : http://www1.skysports.com/rugby-union/news/12506/8543235/Six-Nations-Ronan-O-Gara-may-make-quick-Ireland-return