Bath and Newport Gwent Dragons have been drawn together in the pool stages of next season's Amlin Challenge Cup.
French side Bordeaux-Begles and Italian outfit Mogliano join them in Pool 2.
Premiership rivals Sale and Worcester are paired in Pool 1 alongside this season's semi-finalists Biarritz.
London Irish will face 2013 beaten finalists Stade Francais in the pool stages, promoted Newcastle meet Brive, while Wasps will take on French duo Bayonne and Grenoble.
Challenge Cup pools
Pool 1: Biarritz, Sale, Worcester, Oyonnax
Pool 2: Bath, Newport Gwent Dragons, Bordeaux-Begles, Mogliano
Pool 3: Brive, Newcastle, Calvisano, Bucharest
Pool 4: Wasps, Viadana, Bayonne, Grenoble
Pool 5: Stade Francais, London Irish, Prato, Olympus Madrid