Charles Piutau dislocated a rib cartilage and he will be unavailable for selection for a number of weeks.
Rob Lyttle suffered a hamstring injury of significance and he is expected to return to playing in 4-6 weeks.
Meanwhile, Andrew Trimble (back) and Peter Nelson (hamstring) have returned to training and are in contention for Friday's clash versus Edinburgh.
Medical / injury updates in association with the Ulster Independent Clinic.
