Biarritz Olympique, 2006 Heineken Cup finalists, have lost a second kicker Julien Dupuy through injury.
Dupuy injured his knee in Basque side's Round 3 loss to Glasgow Warriors at Firhill.
Biarritz, currently third in Pool 4, are already without French international scrum half Dimitry Yachvili for the returrn match. He was also ruled out with a knee injury he sustained during the Round 2 clash with Saracens.
Biarritz host Glasgow this weekend for what is now a crucial game for both teams.
The 2006 French champions need to win this weekend to keep alive their hopes of quarter-final spot.
