Richard Cockerill faces a stiff test as he oversees his first match in charge of Toulon on Sunday, live on Sky Sports.
Racing 92 held on with just 13 players for a crucial 10-8 victory at Toulouse on Sunday.
La Rochelle held off a stirring Toulouse fightback to storm back to the French Top 14 summit with a 27-21 win on Sunday.
Stephen Brett marked his Clermont debut with a last-minute penalty as they escaped from Bordeaux with a 23-23 draw.
Wallabies winger Adam Ashley-Cooper will leave Bordeaux at the end of the season after not being offered a new contract.
Ulster finished their disappointing Champions Cup campaign with a 22-26 defeat to Bordeaux-Begles at Kingspan Stadium.
Three penalties from Camille Lopez fired Clermont Auvergne into the Champions Cup quarter-finals as they beat Bordeaux 9-6.
Clermont made it eight wins in eight home games with a bonus-point 30-6 rout of Toulon to regain the lead of the Top 14.
The Champions Cup returns to Sky Sports in January, with fixtures for rounds 5 and 6 announced by EPCR.
Exeter secured a 20-12 victory over Bordeaux-Begles after the French side were reduced to 14 men in the 49th minute.
Exeter's Champions Cup campaign is almost certainly over as they lost 13-7 to Bordeaux-Begles at Sandy Park.
Clermont took control of pool five with a 49-33 win over Bordeaux-Begles at Stade Marcel Michelin on Saturday.
Clermont make three changes ahead of Saturday's Champions Cup Pool 5 clash against Bordeaux-Begles.
Can Scarlets halt Saracens and will the returning Johnny Sexton help Leinster against Montpellier? We preview round two.
Three late tries from Bordeaux-Begles gave them a 28-13 victory over Ulster in the Champions Cup on Sunday.
Bordeaux-Begles fly-half Ian Madigan has warned of Ulster's class ahead of their European clash this weekend.
The European Champions Cup kicks off this weekend and we look at the players who will be lighting up the tournament in round one.
Ahead of the start of Champions Cup, test your knowledge of the history of European club rugby by taking our quiz.
Exeter and Ulster come up against French heavyweights Clermont and Bordeaux in a tough Pool 5.
Adam Ashley-Cooper must undergo tests in France after suffering concussion during the Rugby Championship.