Ireland scrum-half Craig Casey’s shoulder injury will be assessed ahead of Munster’s Investec Champions Cup game with Castres.
Casey, 26, was forced off in the second half of the defeat by Toulon on Sunday and head coach Clayton McMillan said post-match that the injury looked “reasonably serious”.
However, the injury does not appear to be as bad as first feared and he could feature in Munster’s final pool match in Limerick on Saturday (17:30 GMT).
Ireland’s Six Nations campaign begins in France on 5 February and the news will be welcome to head coach Andy Farrell after Casey had established himself as deputy to Jamison Gibson-Park.
Meanwhile, Connacht prop Finlay Bealham is expected to be unavailable for “a couple of weeks” after he injured his knee in the United Rugby Championship defeat by Leinster.
There is also concern for Leinster prop Paddy McCarthy, who sustained a “significant foot injury” in the dramatic European win over La Rochelle, and Andrew Porter will be assessed for an ongoing calf concern.
There is better news as prop Tadhg Furlong is set to return in Leinster’s final pool match in Bayonne on Saturday (15:15 GMT), and backs Garry Ringrose and Jimmy O’Brien will be available while full-back Hugo Keenan has returned to training but will not play in France.
Versatile back Ciaran Frawley was also forced off in the win over La Rochelle with a foot injury and he will be assessed ahead of the game in Bayonne.
