Stuart McCloskey (hamstring) and Zac Ward (ankle) were both injured in Friday night's defeat to Munster.
Both will have scans today to ascertain the extent of their respective injuries.
Ben Carson, Ethan McIlroy, Jake Flannery, Cormac Izuchukwu, Nick Timoney, Iain Henderson and Nathan Doak have all resumed team training following their recent injuries and their fitness for selection this week will be monitored through training.
Stewart Moore (thigh) remains on the current injured player list.