WATCH: Is that David de Gea in disguise?! Man Utd goalkeeper Andre Onana gifts Bayern Munich the lead as he inexplicably lets tame Leroy Sane shot squeeze past him in Champions League clash

Leroy Sane's shot from outside the United box flew towards him and the Cameroon international flapped at it and could only divert it into his own net.

Just four minutes later, Serge Gnabry scored a second for Bayern, giving the Red Devils a mountain to climb in their opening Champions League match of the season.

The latest blunder from the summer signing will see more pressure put on his shoulders in the early stages of his United career. Onana has already had a concerning number of costly errors since joining from Inter, having been humiliated against Nottingham Forest in the Premier League and he was beaten from the halfway line during pre-season.

United have now conceded two or more goals in five consecutive matches - the last time they did that was from May to August in 2001.

After the midweek clash against Bayern, Onana and his Red Devils team-mates will take on Burnley in the Premier League on Saturday.