Manchester United fans reacted furiously after Istanbul Basaksehir's opening goal in the Champions League group-stage meeting.
Ole Gunnar Solskjaer's side are looking to make it three wins from three in Europe this season, following on from victories against Paris Saint-Germain and RB Leipzig.
However, following the 1-0 defeat by Arsenal in the Premier League at the weekend, United 's problems followed them to the Turkish capital.
After conceding possession deep inside Basaksehir's half, United were undone on the counter by one simple pass forward to former Chelsea and Newcastle United striker Demba Ba.
The forward picked up the ball on the halfway line and had acres of space to run into, with nobody around him to stop his run and Dean Henderson left helpless.
Fans flocked to social media to have their say on the defensive shambles.
Things got worse for United when Edin Visca doubled the hosts' lead but Anthony Martial's header before the break reduced the deficit to a single goal.
Victory for United this evening would put them within touching distance of securing a spot in the knockout stages of the Champions League.
However, the Turkish side have made it clear that United face a stern task on their hands if they are to maintain their winning streak in Europe.
