Manchester United paid dearly for a shambolic first-half defensive display as they slipped to an embarrassing 2-1 Champions League defeat against Istanbul Basaksehir.
Ole Gunnar Solskjaer's side, floundering in the Premier League, had started their European campaign in style with an impressive win against Paris Saint-Germain and a 5-0 humbling of RB Leipzig.
But defeat in Turkey - a first-ever Champions League group-stage win for Basaksehir - will heap the pressure on the Norwegian boss, whose side looked short of inspiration and basic defensive nous in Istanbul.
The result ended Manchester United's longest away winning run in all competitions in their history - 10 straight victories - and was their first away defeat in 19 matches since losing in January at Liverpool in the Premier League.
Solskjaer said United's performance "wasn't good enough, against a team that worked and ran".
"They hit us on the break a couple of times, and scored two goals like sometimes happens in Europe when you don't defend well enough," he told BT Sport.
He added: "You don't just turn up and get three points in the Champions League, and that's shown here today. We were not good enough, that's it."
The three-time European champions were badly exposed on the break as former Chelsea forward Demba Ba and Edin Visca gave the home side a two-goal cushion.
United gave themselves hope when they reduced the deficit shortly before half-time through an Anthony Martial header.
But despite multiple second-half changes and an array of attacking talent, Solskjaer's lacklustre team could not find a way past the organised Basaksehir defence.