Champions Cup holders Saracens have been drawn in next season’s ‘group of death’ alongside last year’s semi-finalists Munster and French giants Racing 92.
Pool 4 is completed by Welsh region the Ospreys, who are making a return to Europe’s top-tier after spending the previous campaign in the Challenge Cup.
Elsewhere, there is an intriguing subplot in Pool 2 as Stuart Hogg makes a return to Scotstoun, with Exeter Chiefs and Glasgow Warriors set to go head-to-head.
Meanwhile, four-time winners and beaten finalists in 2018/19 Leinster will be content with their draw after being put into a group that includes Lyon, Northampton Saints and Benetton.
Nevertheless, it is the fourth pool which has caused the biggest talking point with ex-Biarritz scrum-half Dimitri Yachvili, who helped make the draw, stating: “Racing, Saracens and Munster in the same pool looks heavy!”
The Challenge Cup groups were also decided on Wednesday with Pool 3 the standout as Wasps, Edinburgh and Bordeaux-Begles all face-off.
Heineken Champions Cup
Pool 1: Leinster Rugby, Lyon, Northampton Saints, Benetton Rugby
Pool 2: Exeter Chiefs, Glasgow Warriors, La Rochelle, Sale Sharks
Pool 3: ASM Clermont Auvergne, Ulster Rugby, Harlequins, Bath Rugby
Pool 4: Saracens, Munster Rugby, Racing 92, Ospreys
Pool 5: Toulouse, Gloucester Rugby, Connacht Rugby, Montpellier
European Rugby Challenge Cup
Pool 1: Castres Olympique, Worcester Warriors, Dragons, Enisei-STM
Pool 2: Scarlets, RC Toulon, London Irish, Bayonne
Pool 3: Wasps, Edinburgh Rugby, Bordeaux-Begles, Agen
Pool 4: Stade Francais, Bristol Bears, Zebre Rugby Club, Brive
Pool 5: Cardiff Blues, Leicester Tigers, Pau, Rugby Calvisano