It was always going to be a tall order for Barcelona to overhaul Bayern Munich in Bavaria.
The Bundesliga giants remain one of the favourites for the competition, whilst the Catalans are still going through a transitional period with Xavi now in charge.
For two thirds of the first-half the visitors had held their own, however, the opener, when it came, was as expected as it was regrettable.
MORE: Liverpool fans will love this
Robert Lewandowski was allowed far too much time on the ball, and he managed to pick out Thomas Muller who arced his header back over Marc-Andre ter Stegen.
Not the start Barcelona were hoping for ?
Thomas Muller 50th #UCL goal hands Bayern the lead in Munich ?
? Stream live: https://t.co/0BMWdeEYT3 pic.twitter.com/Q7lr25qWUd
— SuperSport ? (@SuperSportTV) December 8, 2021
THOMAS MULLER LOVES SCORING AGAINST BARCELONA ? pic.twitter.com/pV08jK2ptX
— CBS Sports Golazo ?? (@CBSSportsGolazo) December 8, 2021
Pictures from Sky Sports, SuperSport TV and CBS Sports Golazo