Rasmus Hojlund had twice given United the lead but the Turkish team pegged them back each time before Andre Onana’s error led to Casemiro being red carded in his attempt to salvage the situation. Mauro Icardi missed the penalty but made amends with the winner.
Questions will be asked of Onana, uncertain throughout, but much of the defence were culpable for the capitulation. Having lost to Bayern Munich in their opening Champions League game, there is much work to do to progress beyond the group stage now.
Ten Hag’s concerns are more immediate given that United have now lost six of their 10 matches this season.
