Leinster gave Castres a 14-0 head start when the sides met at Stade Pierre-Antoine last January. Matt O'Connor's men fought back to take a 29-22 victory that day and will be aiming for a similar outcome on Sunday afternoon.
Sandy Park in Exeter is the venue for Connacht's 100th European Challenge Cup match. Win number 52 would see the province cement their place at the top of Pool 2, ahead of their December clashes with Bayonne.
The Connacht team to face Exeter Chiefs in round 2 of the European Challenge Cup has been named. Head coach Pat Lam has made eight personnel changes to the side that beat La Rochelle 48-12 last weekend.