Munster are "playing a waiting game" on the fitness of skipper Paul O'Connell's fitness ahead of next month's Heineken Cup semi-final tie against Biarritz Olympique in San Sebastian..
The British & Irish Lions captain was a late withdrawal from the Munster side which beat Northampton Saints 33-19 in last weekend's quarter-finals with a groin injury.
O'Connell will also miss his side's Magners League clash against Connacht and is a major doubt for the trip to Spain for a re-run on the 2006 Heineken Cup final..
Munster team manager Shaun Payne said: "It is an injury that needs rest and we'll be taking that into account over the next few weeks leading up to the semi-final.
"It's not a broken arm or something where there is a defined recovery period. At the minute we're just playing a waiting game."
There was better news for wings Ian Dowling and Doug Howlett, who both underwent scans in the wake of the triumph over Northampton. Two-try hero Howlett suffered a hamstring strain, while Dolwing suffered a knee injury.
But both will be fit to face the French giants as Munster aim to reach the Heineken Cup final for the fifth time.