Tom O'Toole and Sean Reffell's availability for selection will be assessed through the week.
Club captain, Iain Henderson, had toe surgery yesterday. He is now expected to be sidelined for approximately three months.
James Hume (knee) also had surgery yesterday and he will enter a period of rehab for the coming months.
Luke Marshall (concussion) and Rob Baloucoune (hamstring) suffered recent injuries in training and are unavailable for selection this week.
They join Marty Moore, Jake Flannery, Ben Moxham and Callum Reid on the list of players also currently unavailable.
Squad updates in association with The Ulster Independent Clinic.