Joey Carbery could be set for another spell on the sidelines.
Munster say the out-half requires a scan having picked up a wrist injury in Sunday’s draw with Benetton.
Prop Josh Wycherley is out of this weekend’s game with Dragons due to a neck injury.
But scrum-half Craig Casey is available again following his return from the World Cup.
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Ulster expect Ireland tighthead Tom O’Toole to be out for a month.
He requires surgery on a persistent groin injury.
Kieran Treadwell will miss this weekend’s derby with Connacht due to a hip injury, while Dave Ewers and Cormac Izuchukwu are out with head injuries.
JJ Hanrahan is unlikely to be risked in that game due to a knee injury, but Pete Wilkins can once again call upon Jack Carty.