The Pool Draw will take place later this month and the venue, date, time and other details will be announced shortly.
England have seven sides in the draw with 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.
London Wasps (seeded)
ASM Clermont Auvergne or Stade Francais Paris *
Stade Francais Paris or ASM Clermont Auvergne *
Biarritz Olympique Pays Basque
*(French seeded team to be confirmed after the French Championship final being played on Saturday, 10 June)
Benetton Treviso (seeded)
Glasgow Warriors (seeded)
Newport Gwent Dragons