Montpellier will be without Davit Kubriashvili for their return Champions Cup fixture against Castres, live on Sky Sports.
14-man Montpellier produced an inspired second-half performance to beat Castres 32-14 in the Champions Cup on Sunday.
Ahead of round three of the Champions Cup, we take a look at some of the crucial matches taking place this weekend.
Castres get their European campaign up and running with a comprehensive 41-7 bonus-point win over Northampton Saints.
Can Scarlets halt Saracens and will the returning Johnny Sexton help Leinster against Montpellier? We preview round two.
Isa Nacewa's 47th-minute bonus-point try was the highlight of Leinster's 33-15 European Champions Cup win over Castres.
Ahead of the start of Champions Cup, test your knowledge of the history of European club rugby by taking our quiz.
Leinster and Northampton are up against French sides Montpellier and Castres in what promises to be a keenly-contested pool.