Chelsea became the first English team to lose a Champions League game this season as they were outclassed on all fronts by a clinical Roma.
Atletico Madrid are on the brink of an early exit from the Champions League after 10-man Qarabag battled to a 1-1 draw at the Wanda Metropolitano on Tuesday.
Barcelona were held to a 0-0 draw by Olympiakos as they failed to score in a Champions League group stage game for the first time in five years.
Juventus forward Gonzalo Higuain scored a trademark goal to salvage a 1-1 draw for the Serie A side after they had been rattled by lively Sporting in the Champions League on Tuesday.
FC Basel 1:2 CSKA Moscow
Manchester United 2:0 Benfica
Celtic 1:2 Bayern Munich
PSG 5:0 Anderlecht
Atletico Madrid 1:1 FK Qarabag
Roma 3:0 Chelsea
Olympiakos 0:0 Barcelona
Sporting 1:1 Juventus