Leo Cullen is sweating on Johnny Sexton and Ross Byrne ahead of Friday's Heineken Champions Cup game with Toulon at the RDS Arena.
Sexton has entered the graduated return to play protocols and will be assessed during the week, while Ross Byrne took a knock to his knee against Munster rugby and will require further assessment this week.
There is better news for Cian Kelleher who has recovered from his hamstring injury and is due to train this week.
Vakh Abdaladze will again look to increase his involvement in team training this week as he continues to recover from a back injury
While Scott Penny sustained an injury to his hand against Ospreys and will be unavailable for selection.
Jimmy O'Brien (hamstring), Garry Ringrose (ankle), Will Connors (knee), James Ryan (concussion), Rowan Osborne (hand), Tommy O’Brien (ankle), Adam Byrne (quad), Caelan Doris (concussion), Dan Leavy (knee), Conor O’Brien (knee) and Max Deegan (knee) are all unavailable.