Leinster recorded back-to-back league victories for the first time this term with a 33-8 win over Edinburgh at the RDS .
Table-toppers Ospreys host Connacht on Friday looking to make it seven wins on the bounce in the Guinness PRO12.
Ian Madigan kicked all his side's points as Leinster beat Castres 21-16 in the European Champions Cup.
Devin Toner heaped praise on team-mate Ian Madigan after the centre kicked Leinster to victory over Castres.
Leinster will aim to take control of Pool 2 on Sunday as they travel to France for a showdown with Castres (kick-off 1pm).
Leinster came through a tough first examination in the Champions Cup as they edged out Wasps 25-20 at the RDS Arena.
Matt O'Connor was delighted with the "great" contributions of Leinster's bench players after they toppled Wasps.
Leinster will be without Rob Kearney when they host Wasps in their opening European Rugby Champions Cup Pool 2 clash.
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