O Brien’s injury could rule him out for season

Sean O’Brien’s shoulder injury is worse than first feared.

Leinster have confirmed that that the flanker needed open surgery which adds a month to the recovery time meaning he could miss the entire season.

Arron Dundon and Rhys Ruddock continue to recover from their injuries and have not yet been ruled out for the game away to Castres on Sunday afternoon.

Rory Best has been named in the Ulster team to face Montpellier tomorrow night at Ravenhill.

The hooker returns for the first time since breaking his arm against the All Blacks.