Leicester Tigers will learn their opponents for next season's European Rugby Champions Cup when the draw takes place in Neuchatel, Switzerland on Wednesday (June 17).The pool draw for the 2015/16 European Rugby Challenge Cup starts at 1.15pm (UK time) and will be followed immediately by the draw for the European Rugby Champions Cup pools.   Both draws will be broadcast live on epcrugby.com with further coverage on BTsport.com, Sky Sports News and beIN Sports. Twenty clubs from the Aviva Premiership, the Top 14 and the Guinness Pro12, including two-time European champions Tigers, have booked their places in the 2015/16 European Rugby Champions Cup.   The clubs will be divided into four tiers of five and a draw will be conducted to establish Tier 1 with two of the three second-ranked clubs – Bath Rugby, Munster Rugby and the Top 14 beaten finalists – joining Saracens, Glasgow Warriors and the Top 14 champions in the top tier.   Once Tier 1 has been established, the remaining three tiers will fall into place. Tier 2 will include the three third-ranked clubs from the leagues - Northampton Saints, RC Toulon and Ospreys - as well as the second-ranked club which was not drawn into Tier 1 and fourth-ranked club from the same league as the club which was not drawn into Tier 1.   Tier 3 will include the two clubs ranked fourth which are not in Tier 2 as well as the three fifth-ranked clubs from each league - Exeter Chiefs, Racing 92 and Leinster Rugby.   Tier 4 will contain the sixth-ranked clubs from the leagues - Wasps, Oyonnax and Scarlets - as well as Benetton Treviso and the winner of the Champions Cup play-offs, Bordeaux-Bègles.   When the tiers are completed, the draw proper for the five pools will be made, and during the draw, some clubs may have to be placed directly into a pool in order to ensure that the key principles apply (see below).   In Tier 4, Wasps will be drawn into a pool which contains one other Aviva Premiership club and Oyonnax and Bordeaux-Bègles will be drawn into pools which each contain one other Top 14 club.   Champions Cup qualification   For the purposes of creating the tiers, the Aviva Premiership, Top 14 and PRO12 clubs are ranked based on their league performances and on their performances in the knockout phases. For clubs which did not qualify for the knockout phases of their leagues, or which were eliminated at the same stage of the knockout phase, rankings are decided by league table finishing positions.   Rank Aviva Premiership      Top 14                         PRO12                     1 Saracens Clermont or SF Paris Glasgow Warriors 2 Bath Rugby Clermont or SF Paris Munster Rugby 3 Northampton Saints RC Toulon Ospreys 4 Leicester Tigers Toulouse Ulster Rugby 5 Exeter Chiefs Racing 92 Leinster Rugby 6 Wasps Oyonnax Scarlets 7   Bordeaux-Bègles Benetton Treviso   Pool draws – key principles   The 20 clubs are divided into four tiers based on their qualification position from their leagues. This will be done where necessary by a draw. The 20 clubs will then be divided into five pools of four clubs each.????????????? Each of the five pools will have at least one club from each of the three leagues. Each of the five pools will have one club from each of the four tiers. There will be no more than two clubs from the same league in a pool. No pool will contain two PRO12 clubs from the same country. Clubs from the same league will be kept apart until the allocation of the Tier 4 clubs. 2015/16 Tournament weekends  Round 1:?12/13/14/15 November  Round 2:?19/20/21/22 November  Round 3:?10/11/12/13 December  Round 4:?17/18/19/20 December  Round 5:?14/15/16/17 January 2016  Round 6:?21/22/23/24 January 2016  Quarter-finals:?7/8/9/10 April 2016  Semi-finals:?22/23/24 April 2016  Finals:?13/14 May 2016