With four rounds of the tournament already completed, the 24 teams are competing for just eight places in the quarter-finals.
Round 5 is set to witness some mouthwatering encounters.
Pool 3 leaders Toulon host double European Champions Munster with just two points separating the sides.
Last season's finalists Biarritz Olympique, who currently lead Pool 4, travel to Ravenhill to face second placed Ulster and first also plays second when the Scarlets line up against Leicester Tigers in Pool 5.
For full details on the announcement tomorrow, follow ercrugby.com