The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
O'Leary was stretchered off in the early stages at Musgrave Park just after he had set up Munster's opening try and was taken to Cork University Hospital where the injury was confirmed.
He will be reassessed today by a specialist.
Munster coach Tony McGahan said: "It goes without saying that we are very disappointed to lose a player of Tomas's stature at this crucial stage of the season, even more particularly so, from his own personal point of view, given that he had just been selected to tour with the Lions, and our thoughts are with him in that regard."