Luis Suarez nets the winner as Barcelona score two goals in two minutes to come from behind to beat Bayer Leverkusen.
Arsenal are bottom of Group F after a shock Champions League defeat by Greek side Olympiakos at Emirates Stadium.
Robert Lewandowski takes his tally to 10 goals in three matches as Bayern Munich beat Dinamo Zagreb 5-0 at the Allianz Arena.
Manager Louis van Gaal believes Manchester United have a “realistic” chance of winning the Champions League by 2017.
Preview followed by live coverage of Wednesday’s Champions League game between Manchester United and VfL Wolfsburg.
Gareth McAuley and Niall McGinn are named in the Northern Ireland squad to face Greece and Finland despite injury concerns.