Ethan McIlroy had knee surgery last week to repair a torn ACL he suffered in last month's Investec Champions Cup Round 3 defeat to Leicester Tigers.
Werner Kok has had recent wrist surgery and he is unavailable for selection this week.
James Hume (knee), Stuart McCloskey (hamstring) and Jacob Stockdale (hamstring) have all reintegrated into full team training and are available for selection.