Niall Ronan will miss Munster's final Heineken Cup pool game against Northampton having sustaining a knee injury in the opening half of the game against Castres on Saturday.

Ronan had a scan today that showed he's suffered ligament damage to his left knee, but he will have to have further examination before the full extent of the injury can be ascertained.

He becomes the third number seven to end up on the injured list but there was good news for Mike Sherry who is expected to see action in either the AIL or British & Irish Cup this weekend.