Brive climbed above Worcester Warriors to qualify for the European Challenge Cup quarter-finals with a 33-7 win, but only after the match had been postponed and then moved to an alternative venue.
James O'Connor has rejoined the Reds, signing a two-year contract with Queensland and Australian Rugby that makes him eligible for his country's World Cup campaign.
Clermont Auvergne held off a Harlequins fightback to triumph 32-27 and set up an all-French final against La Rochelle in the European Challenge Cup.
La Rochelle booked its place in the European Challenge Cup final for the first time thanks to a tightly contested 24-20 win over Sale Sharks.
Harlequins edged out Worcester Warriors 18-16 in a tense European Challenge Cup quarter-final clash at Sixways Stadium.
Chris Ashton marked his competitive Sale Sharks debut with a sensational hat-trick in a 34-13 beating of Connacht in the European Challenge Cup.
Tom Howe scored a first-half double as Worcester Warriors pulled off a shock 38-27 European Challenge Cup bonus-point win at Stade Francais and 12-try La Rochelle humiliated Enisei.