Connacht and Leinster away.
Three of the Irish sides are in action in the Heineken Champions Cup later today.
On the back on an excellent opening round win against Montpellier, Connacht have a tough game in prospect away from home against Toulouse. Kick off at 1pm.
Leinster will also face formidable opposition when they travel to face Lyon in a match that will get underwayat 3.15pm.
Munster will be hoping that home advantage can count when they play Racing '92 at Thomond Park at 5.30pm.
Former Munster stars Simon Zebo and Donnacha Ryan will line out in the Racing starting XV.
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