70. Ziyech threads a pass from wide on the right into the path of Akturkoglu who takes a wonderful first touch.
That sets him up inside the box perfectly and he smashes his second touch beyond Onana and into the net.
It flies by the keeper at his front post and the stadium goes bonkers.
WHAT A GOAL - GALATASARAY ARE LEVEL THROUGH AN AKTURKOGLU WONDERSTRIKE!
67. Ziyech has a strike at goal from the corner of the box and Icardi is following it.
It's flying towards goal and Onana punches clear before the linesman's flag goes up.
Before that, Garnacho is almost sent clear by Fernandes as the Galatasaray line is very, very high. One for United to try and exploit.
65. Akturkoglu again involved in the next phase as he receives a pass 25 yards from goal and goes for the curler.
It's read by Onana who gets across and shows he can make a simple save after all.
64. Wan-Bissaka is shown a yellow card for a foul out wide on the left.
This time it is a cross into the box from Akturkoglu and it's headed to safety.
Honest to goodness, £47million Onana cost - and he's costing them a lot more on the park.
There's one man in the wall and Ziyech fires it probably looking for a cross which is straight at Onana.
He goes down low to parry it away and it bounces in front of him and he parries it behind him and into the net.
Two mistakes again tonight - anyone got Davie's number!?
GALATASARAY SCORE FROM THE FREE KICK
ABYSMAL GOALKEEPING ONCE AGAIN FROM ANDRE ONANA
60. Torreira again escapes a booking with a foul on McTominay on halfway.
United don't make use of the set piece and the home side break down the right before Fernandes fouls Ziyech.
This one is 25 yards from goal and a bit wider than his first goal.
59. Luke Shaw crunches into Ziyech inside the Galatasaray half.
He protests with the referee but it's a clear foul and he's shown a yellow card.
Erik ten Hag immediately reacts by making a double substitution and the youngster Kobbie Mainoo is on his way!
The home side make a double change themselves as Dries Mertens' departure is met with boos by the home supporters...
55. He's a goal machine for his country and now Scott McTominay has his first Champions League goal!
It's a peach of a counter attack and Wan-Bissaka is sent down the right as the United players flood the box.
The defender does ever so well to square it into the path of McTominay who lets it run across his body before sidefooting a left-footed strike in at the near post.
Fabulous goal and there's silence in this arena once more.
UNITED'S TWO-GOAL LEAD IS RESTORED THROUGH SCOTT MCTOMINAY!!
53. Ayhan wipes out Hojlund but the game continues as Garnacho streaks away.
His shot goes wide before Ayhan is shown a yellow card.
52. Galatasaray win a corner after good work from Lindelof.
It's cleared to the edge of the box where Garnacho heads it clear before being clattered by the already-booked Boey.
Ten Hag and Fernandes asking the question but nothing doing from the referee....
51. Almost another for United.
Fernandes' cross in from the right is headed straight for goal and Muslera tracks back to his line really well to claw it away from under his crossbar.
It almost lands at Hojlund's feet but it's scooped to safety.
50. Amrabat is fouled 10 yards into the Galatasaray half and United get their first chance to pile forward.
Fernandes' deep ball is cleared to safety by Boey.
Just after that, a flash of lightning lit up the sky above...
BIG CHANCE
47. A fabulous cross into the United box from the right finds the big defender Ayhan up from the back.
He scuffs his first time finish at the near post into the side net, but three quarters of the ground thought that was in.
Let off for United early on.
46. Ziyech gets an early chance to put the ball into the box as Angelino is fouled.
It's about 35 yards from goal and is clipped in but cleared easily.
The second half kicks off in Istanbul - and it's a big one at that!
The hosts get us back underway.
The players come back onto the pitch as the rain continues to pour.
Ready for a start.
The hosts have enjoyed more possession, more passes and more efforts at goal in that first half.
The visitors have the most goals.
And breathe... What a half of football.
Man Utd stunned the home support when Alejandro Garnacho smashed in the opener with his left foot after 11 minutes.
You could hear a pin drop when Bruno Fernandes unleashed an outstanding strike seven minutes later which rifled into Muslera's top corner and United were in dreamland.
But Ziyech's free kick goal on 29 minutes halved the deficit - Andre Onana will be disappointed as it goes down the middle of the goal.
United saw out the half well though were lucky the automated VAR picked up on a narrow offside when Icardi went through to score. The linesman's call was a good one.
All to play for in the second half!
Maguire heads it clear and that's it for the first half.
It's been lively to say the least and United have the edge.
HT: Galatasaray 1-2 Man Utd
45+1. Amrabat is shown a yellow card for a tackle in the middle of the United half on Mertens.
Late chance for the home side to flood the box in this half.
45. Two minutes added on.
Zaha looks to have been played into the box on the left before losing his footing.
He then handballs it on the way down and United look to have seen it out.
