The 2016/17 Challenge Cup draw took place on Wednesday and last year’s finalists, Harlequins have been drawn in Pool 5.
The runners-up will do battle in Pool 5 with Edinburgh, Stade Français and Challenge Cup new boys Timisoara Saracens.
In Pool 1, Gloucester will face La Rochelle, Treviso and Top 14 side Bayonne while in Pool 2 Ospreys will compete with Grenoble, Newcastle Falcons and Lyon.
Worcester Warriors, Brive, and Newport Gwent Dragons are joined by Russian club Enisei-STM in Pool 3 and finally a very interesting Pool 4 with plenty of local derbies sees Bath drawn alongside Cardiff Blues, Pau and Premiership newcomers Bristol.
Both finals of the Challenge and Champions Cup will be played at Murrayfield in Edinburgh.
Challenge Cup Pools 2016/2017
Pool 1: La Rochelle, Gloucester, Treviso, Bayonne
Pool 2: Ospreys, Grenoble, Newcastle Falcons, Lyon
Pool 3: Brive, Worcester Warriors, Newport Gwent Dragons, Enisei-STM
Pool 4: Cardiff Blues, Bath, Pau, Bristol
Pool 5: Harlequins, Edinburgh, Stade Français, Timisoara Saracens
— Challenge Cup (@ERChallengeCup) 29 June 2016