Marcell Coetzee sustained a significant left knee injury in the fixture against Zebre on Saturday evening. He will undergo exploratory surgery next week to fully ascertain the extent of the injury.
Conor Joyce (right knee), Jonny Murphy (left shoulder) and Ross Kane (right thumb) sustained injuries in the Ulster A game against Munster A on Sunday afternoon.
Andrew Trimble has had surgery for a left hand fracture sustained in the game against Treviso at the start of the month. He is expected return to action in approximately four weeks.
These players join Jonny Simpson (neck), Callum Patterson (ankle), Lorcan Dow (ankle), Louis Ludik (concussion), Kyle McCall (hamstring), Stuart McCloskey (calf), Johnny McPhillips (groin), Stephen Mulholland (shoulder) and Rob Lyttle (shoulder) on the current injury list.