Ulster have suffered a setback with skipper Johann Muller set to miss several matches because of a hand problem.
The South African lock sustained the injury in Friday night's Heineken Cup win over Glasgow at Scotstoun.
A medical scan after the game revealed Muller had ruptured ligaments around his thumb and he had surgery on Sunday.
Muller, who has played 50 times for the Irish province, is expected to be out for up to eight weeks.
That would rule him out of a string of Pro12 matches and the back-to-back Heineken Cup clashes with Northampton in December.
Unbeaten Ulster's next match is at home to the Dragons in the Pro12 on Friday, 25 October.