Biarritz beat Sale Sharks in the last of the European quarter-finals to give France an interest in the semi-finals later this month.
Biarritz won a dour encounter 11-6 and will play another English club, Bath, in the semi-finals. Bath stunned Leicester Tigers 15-12 on Saturday.
It will be an all-Ireland affair in the other semi-final with Irish glamour clubs Munster and Leinster opposing each other.
Leinster stunned champions Toulouse 41-35 in Toulouse, while Munster ground out a 19-10 win against Perpignan.