Leinster have been confirmed as one of the top seeds for next season's inaugural European Rugby Champions Cup along with Heineken Cup and French champions Toulon and English table toppers Saracens – who contested last month's Heineken Cup decider.
Saracens have been placed in the top pot ahead of Northampton as they finished higher in the Aviva Premiership table, before losing to the Saints in the final of the competition.
The draw for the pool stages of the new competition will be held at the Stade de la Maladiere in Neuchatel, Switzerland at 12 noon tomorrow, with the seedings coming from the participants' finishing position in their domestic leagues.
With the competition set to be run with five groups of four, the three champions will be joined by two of the beaten finalists from the three leagues who will be drawn tomorrow, with the rest falling into place from there.
Munster will be among the second seeds, while Ulster could join them in that pot if the draw goes their way.
No pool will contain two Pro12 clubs from the same country
Connacht, meanwhile, will go into the Challenge Cup draw.
Rankings for Rugby Champions Cup:
Rank 1: Saracens, Toulon, Leinster
Rank 2: Northampton Saints, Castres, Glasgow Warriors
Rank 3: Leicester Tigers, Montpellier, Munster
Rank 4: Harlequins, Racing Metro, Ulster
Rank 5: Bath, Clermont Auvergne, Ospreys
Rank 6: Sale Sharks, Toulouse, Scarlets
Rank 7: Wasps, Treviso