Billy Burns sustained an elbow injury during the second half of Saturday's Champions Cup defeat at Bath. His fitness for this week's fixture against Racing will be monitored over the coming days.
Luke Marshall, Will Addison and Marcus Rea have all now resumed full team training following their respective recent injuries.
Ben Moxham suffered an ACL tear of his left knee in the recent game against Edinburgh and will have surgery to repair this. His estimated return to play time is 9 months.
In addition to Ben, the following senior squad players are currently unavailable for selection due to injury:
Angus Curtis, David McCann, Ben Carson, James McCormick, Ethan McIlroy, Sean Reffell and Callum Reid.
Squad updates in association with The Ulster Independent Clinic.