Leinster's Gordon D'Arcy will have to sit out the next few weeks through injury.
D'arcy, who scored the Blues first try in their victory over Montferrand on Saturday, was badly injured by French international winger David Bory.
The Irish winger suffered bruising to his left lower back and pelvic area and had to be stretchered off after the clash with Bory.
The Leinster management are currently deciding whether to take action against the Frenchman - but will have to do so by 4pm today if he is to miss Friday's return fixture.