Bath and Wasps will have to overcome Toulon and Leinster if they are to reach to the Champions Cup quarter-finals after they were drawn with the French and Irish giants today in Neuchatel.
Premiership finalists Bath and the fast-improving Wasps made the last eight this season, losing to Leinster and Toulon, and they will face them again home and away this time in Pool 5.
Premiership champions Saracens are in in Pool 1 alongside Ulster, four-time winners Toulouse and newcomers Oyonnax.
Glasgow Warriors, who became the first Scottish club to win a major title in the professional era when they were crowned Guinness PRO12 champions, were drawn in Pool 3 against Northampton, Racing 92 and Scarlets.
Munster, the highest-ranked Irish club from the PRO12, will face Top 14 champions Stade Francais Paris, Leicester and Treviso in Pool 4.
Ospreys, the top-ranked Welsh club, were drawn in Pool 2 where they will come up against Clermont Auvergne, who lost both the Champions Cup and Top14 finals this past season, Exeter Chiefs and Bordeaux-Begles.
In the Challenge Cup, Sale Sharks, the number-one ranked Aviva Premiership club, will play Newport Gwent Dragons, Castres Olympique and Pau in Pool 2, while Connacht Rugby, the highest-ranked PRO12 representative, are in Pool 1 against Brive, Newcastle Falcons and Enisei-STM.
2015/16 Champions Cup poolsÂ
Pool 1: Saracens, Ulster, Toulouse, Oyonnax
Pool 2: Clermont Auvergne, Ospreys, Exeter, Bordeaux-Begles
Pool 3: Glasgow, Northampton, Racing 92, Scarlets
Pool 4: Stade Francais, Munster, Leicester, Treviso
Pool 5: Bath, Toulon, Leinster, Wasps
2015/16 Challenge Cup poolsÂ
Pool 1: Connacht, Brive, Newcastle, Enisei
Pool 2: Sale, NG Dragons, Castres, Pau
Pool 3: Montpellier, Harlequins, Cardiff Blues, Calvisano
Pool 4: La Rochelle, Gloucester, Zebre, Worcester
Pool 5: Edinburgh, London Irish, Grenoble, Agen
2015/16 Tournament weekends
Round 1: 12/13/14/15 November
Round 2: 19/20/21/22 November
Round 3: 10/11/12/13 December
Round 4: 17/18/19/20 December
Round 5: 14/15/16/17 January 2016
Round 6: 21/22/23/24 January 2016
Quarter-finals: 7/8/9/10 April 2016
Semi-finals: 22/23/24 April 2016
Finals: 13/14 May 2016
