All four Irish provinces will be involved.
Leinster will begin their Champions Cup campaign against Bath in December.
Their Pool A opener has been fixed for Saturday, December 11th at the Aviva Stadium.
Ulster are away to Clermont that evening.
The following day, Munster are in Coventry for a meeting with Wasps.
Also on the Sunday, Connacht open their campaign away to Stade Francais.
Here's the full pool stage fixture list for your calendar:
LEINSTER
Round 1: Leinster v Bath - Saturday - December 11th - 3:15pm
Round 2: Montpellier v Leinster - Friday - December 17th - 9pm
Round 3: Leinster v Montpellier - Sunday - January 16th - 1pm
Round 4: Bath v Leinster - Saturday - January 22nd - 1pm
CONNACHT
Round 1: Connacht v Stade Francais - Sunday - December 12th - 1pm
Round 2: Leicester v Connacht - Sunday - December 19th - 1pm
Round 3: Connacht v Leicester - Saturday - January 15th - 3:15pm
Round 4: Stade Francais - Sunday - January 23rd - 2pm
R1️⃣ fixture details 📢
— Heineken Champions Cup (@ChampionsCup) October 7, 2021
Best game?#HeinekenChampionsCup ➡️ https://t.co/8F7pixrtUi pic.twitter.com/p2JqMAEzPt
MUNSTER
Round 1: Wasps v Munster - Sunday - December 12th - 3:15pm
Round 2: Munster v Castres - Saturday - December 18th - 8pm
Round 3: Castres v Munster - Friday - January 14th - 9pm
Round 4: Munster v Wasps - Sunday - January 23rd - 3:15pm
ULSTER
Round 1: Clermont v Ulster - Saturday - December 11th - 6:30pm
Round 2: Ulster v Northampton - Friday - December 17th - 8pm
Round 3: Northampton v Ulster - Sunday - January 16th - 3:15pm
Round 4: Ulster v Clermont - Saturday - January 22nd - 5:30pm
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