Guinness Premiership champions Wasps drew Magners League champions Leinster, Castres and Edinburgh in Pool Two.
Leicester have possibly an even tougher pool with French side Perpignan and Welsh powerhouse the Ospreys - who supply almost all of the Six Nations champion side.
Italian side Treviso are the minnows in the pool and will be hopeful of matching their one-win performance of last season.
English side Harlequins have been pitted against French giants Stade Francais, Llanelli Scarlets and Ulster in Pool Four.
Last season's runners-up Toulouse are in Pool Five with Bath, Newport Gwent Dragons and Glasgow, while Gloucester are drawn to face French giants Biarritz, Cardiff Blues and Calvisano of Italy.
The draw in Dublin was seeded for the first time, with 24 teams from six nations split into four tiers.



