Manchester United's woes took a turn for the worse as Istanbul Basaksehir punished shambolic defending to inflict a 2-1 first Champions League defeat on Ole Gunnar Solskjaer's side
 United travelled to Turkey on the back of impressive victories over Paris Saint-Germain and RB Leipzig, but found themselves two down inside 40 minutes as strikes from Demba Ba and Edin Visca capitalised on a defensive horror show, which Solskjaer labelled "unforgivable"
Anthony Martial's instinctive header pulled one back before the break but it failed to inspire a second-half comeback, with a stunning stoppage-time goal-line clearance from Alexandru Epureanu denying United a point at the death
Newcomers Basaksehir didn't have a Champions League point or a goal to their name before kick-off but a resilient performance earned a famous and deserved first win in the tournament for the Turkish champions, as United became the first English club to lose in this season's competition on the banks of the Bosporus
United looked to be effectively carrying out their gameplan early on, with Bruno Fernandes rifling a volley wide and Luke Shaw whistling a shot past the post inside 10 minutes, but it all unravelled for Solskjaer's side in farcical circumstances before the quarter-hour mark
Basaksehir captain Visca blazed a shot over and United failed to heed the warning as a simple punt from the back released Ba in behind the visitors' non-existent backline, and the Senegal striker strode unopposed through on goal before slotting past European debutant Dean Henderson
Ba was a constant thorn in the side of Axel Tuanzebe and was incensed when the United centre-back only received a yellow for a desperate last-man challenge on the Basaksehir striker as he ran through on goal again
Just as United seemed to have steadied the ship following the early setback, their defensive frailties were exposed for a second time as Deniz Turuc picked Juan Mata's pocket, broke forward and sent a cross in that Ba brilliantly dummied for Visca to rifle in the hosts' second
But United were able to grab a lifeline before the half was over, with Martial steering a brilliant header into the far corner to halve the deficit with their first attempt on target on 43 minutes
After a performance in stark contrast to his stunning display at Paris Saint-Germain, Tuanzebe was hooked at the interval, as Scott McTominay came on to add another layer of protection in front of United's porous defence
The ease with which Basaksehir contained United's attack prompted further reinforcements from the bench, with Edinson Cavani, Paul Pogba and Mason Greenwood summoned, but they failed to galvanise the visitors
United nearly got out of jail when substitute Mehmet Topal diverted the ball back towards his own goal line, but Epureanu's stunning clearance ensured it was a night to savour for Baseksehir - and one to forget for Solskjaer
Man Utd boss  told : "The 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 you sometimes do in Europe when you don't defend well enough
"The first one we forget about the man up top and that's unforgiveable
 The second one, we're not very well organised to counter-press and win the ball back when we're playing
 So two tough goals to giveaway and then we didn't have enough to come back second half
"We scored from a cross, a good goal by Anthony, and then you think 45 minutes to save something from the game but second half we threw everything at it, but we couldn't break them down
"It's set us back a lot, of course it has
 You get a reality check every time you play a football game here
 Nothing becomes history quicker than a game of football
 You don't just turn up and get three points in the Champions League
 That's shown here today
"It's not easy to be positive now
 Of course it isn't
 When you've just lost the way we did
 But these players they're good players and we have a chance on Saturday morning to get going again
"Asked in the post-match press conference if he fears for his future, Solskjaer added: "I decline to comment on such a thing
 Of course, it's early on and opinions are out there all the time
 You've got to stay strong
 I'm employed by the club to do a job and I do that to the best of my ability with my staff
"The 35-year-old former Premier League striker rolled back the years, tormenting the United defence with a vintage performance
The Senegal international wrote his name in Istanbul Basaksehir history by scoring their first Champions League goal
 The effort was reminiscent of his iconic strike against Liverpool in 2014 as he raced through on goal, only this time there was no Steven Gerrard slip, just woeful United defending
Ba's clever stepover was as good as an assist as Visca doubled the Basaksehir lead before the break, and the removal of Tuanzebe from the firing line at half-time was a testament to his fine performance
Manchester United travel to Everton in the Premier League on Saturday at 12
30pm
 Istanbul Basaksehir host Genclerbirligi in the Turkish Super Lig on Sunday at 1pm
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