Zac Ward sustained a concussion during Saturday's Investec Champions Cup fixture against Leicester Tigers.
He will now follow the World Rugby Graduated Return to Play Protocols.
Ethan McIlroy was removed with a significant knee injury and will see a knee surgeon this week to assess the extent of the injury.
Rob Herring, Tom Stewart, Michael Lowry and Stewart Moore have all now resumed full training and their fitness for selection will be monitored through the coming week.