Once again, all games will be shown live on BT Sport and beIN SPORTS, starting on Friday evening.

Racing 92, Ulster Rugby, Stade Rochelais, Harlequins, Leicester Tigers, Munster Rugby and Bristol Bears all secured their last 16 places in Round 3, but a further 13 clubs have a mathematical chance of qualifying.

These include Castres Olympique, who could progress from Pool B with victory at Harlequins in the weekend’s opening match at 20:00 (All UK & Irish time).

Saturday’s packed programme kicks off in Pool A at The Recreation Ground at 13:00 (free-to-air coverage is provided by Channel 4 and Virgin Media), where Leinster Rugby know victory against Bath Rugby would secure their qualification.

The same equation is true for defending champions Stade Toulousain who will progress from Pool B if they can win at home to Cardiff Rugby (14:00).

At 15:30, Union Bordeaux-Bègles also have Pool B qualification in their own hands, but to achieve this they must win at Leicester, who have an impressive 100% European record this season.

Two hours later, Ulster host ASM Clermont Auvergne in a heavyweight Pool A clash that the French side must win to guarantee their own knockout spot.

Kicking off at the same time, Bristol will look to end their Pool B campaign in style at Scarlets. S4C provides additional coverage of that game.

Glasgow Warriors, who host La Rochelle at 20:00 on Saturday, occupy the final qualifying spot in Pool A, but they and ninth-placed Montpellier Hérault Rugby could both progress with wins should results elsewhere go their way.

Sunday’s schedule begins with Sale Sharks hosting Ospreys at 13:00, knowing victory will see them through from Pool A. An hour later, Connacht Rugby will be in the same position when they visit Stade Francais Paris in Pool B.

Wasps must achieve the huge task of beating Munster at Thomond Park at 15:15 to guarantee their progression, otherwise they face a nervy weekend following results elsewhere.

Two Pool A clashes round off the weekend. Going into Round 4, it is still mathematically possible for Northampton Saints to qualify with a bonus-point victory at Racing at 16:15.

The final fixture could be a real cracker, with Exeter Chiefs facing Montpelier Hérault Rugby at GGL Stadium at 18:30. Both sides have realistic hopes of progressing, although only Exeter have their destiny in their own hands.

Nine places remain up for grabs in the Heineken Champions Cup knockout phase as clubs enter an exciting final weekend of pool matches.