Michael Lowry sustained a groin injury in training last week and is currently unavailable for selection.
Robert Baloucoune had successful elbow surgery last week and will thus be sidelined for a number of weeks.
Injury doubts for this week's fixture against Ospreys include James Humphreys (hamstring), Jack Murphy (ribs), Jake Flannery (shoulder) and Jude Postlethwaite (hand).
All of these will have their fitness for selection assessed through training this week.
Sam Crean (knee), Charlie Irvine (lower leg) and Cormac Izuchukwu (concussion) have all resumed full team training and are currently available for selection.