Ronan O'Gara suffered an ankle injury during Ireland's 17-20 loss to France at Croke Park yesterday.
The Munster out-half who scored all of his side's points - four penalties and a try - finished the game but the ankle became swollen afterwards.
Coach Eddie O'Sullivan said that it was unlikely the number 10 would train this week but that he expected him to be fully fit for the visit of England in two weeks time.