Billy Burns (concussion) and Rob Herring (ribs) sustained injuries during Saturday's Heineken Champions game against Stade Rochelais, and will be unavailable for selection this week.
Angus Curtis suffered a knee injury playing for the Ulster ‘A’ team against Ealing Trailfinders on Friday, and he too is currently unavailable for selection.
These players join Will Addison (lower leg), Rob Baloucoune (hamstring), James Hume (concussion), Ian Madigan (knee), Tom O'Toole (abdomen), Jude Postlethwaite (shoulder), Jacob Stockdale (ankle), Aaron Sexton (hand) on the current injured players list.
Squad updates in association with The Ulster Independent Clinic.