Leinster duo Zane Kirchner and Shane Jennings will both miss their side's clash with Munster in the Guinness PRO12 this Saturday due to ongoing hamstring injuries.
They are both still nursing their leg injuries and will not be risked by the Leinster management team.
There is better news for the champions with regard to Richardt Strauss, who trained this week and has recovered from his hamstring injury. He is available for selection.
Noel Reid will also be available having picked up a slight ankle knock against Glasgow Warriors.
Sean O'Brien continues to progress with his ankle injury, but is seeing a specialist on Friday about his previous shoulder injury and will also be unavailable for the tie.
Likewise, Dave Kearney is still recovering from his knee injury and has yet to return to full contact training.