Manchester United fans were left enraged after a video emerged showing Galatasaray supporters appearing in multiple stands of the home end at Old Trafford following their shock 3-2 loss on Tuesday.
The Red Devils continued their chaotic start to the season with a sixth defeat in ten games as Wilfried Zaha, Kerem Azturkoglu and Mauro Icardi all netted to heap misery on Erik ten Hag's side. Rasmus Hojlund had netted a double for United earlier, but could not inspire his team to victory.
To add insult to injury, United fans noticed Galatasary fans celebrating the result in the home end, with hordes of the travelling supporters dotted around Old Trafford.