Munster's round 2 Champions Cup trip to Stade Francais, and Ulster's clash away to Oyonnax were among the games called off in the wake of the Paris terror attacks.
Meanwhile Ulster are in Champions Cup action this evening, playing host to Saracens in Pool 1.
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Iain Henderson is back for the first time since the World Cup after recovering from a hand injury, and he'll earn his 50th provincial cap.
Kick off at Ravenhill is at 7.45.