The actual Pool draw will take place later this month and the venue, date, time and other details will be announced shortly after that.
England have the largest representation with seven sides in the draw with title holders London Wasps seeded. France have six teams and their seedings will be decided after the French Championship Final.

Leinster are the seeded team for Ireland. Teams that are seeded from each country will be drawn into separate Pools as part of the Pool draw.

England (7)
London Wasps (seeded)
Leicester Tigers
Gloucester Rugby
Bristol Rugby
Saracens
London Irish
NEC Harlequins

France (6)
ASM Clermont Auvergne /Stade Francais Paris *
Toulouse
Biarritz Olympique Pays Basque
Perpignan
Bourgoin   *(French seeded team to be confirmed after the French Championship final being played on Saturday, 10 June)

Ireland (3)
Leinster (seeded)
Ulster Rugby
Munster

Italy (2)
Benetton Treviso (seeded)
Viadana

Scotland (2)
Glasgow Warriors (seeded)
Edinburgh

Wales (4)
Ospreys (seeded)
Cardiff Blues
Llanelli Scarlets
Newport Gwent Dragons