'Hard to accept': Ten Hag slams Man United players for 'unacceptable' mistakes vs Arsenal
Ten Hag said after 3-2 defeat at the Emirates: "It was a great game, a lot of tempo and the audience is the big winner.
"Two top teams but of course we are disappointed when you lose this game in the late stage. All the goals we conceded today are mistakes, it can't happen.
"Even last week we were so hard to beat in such situations, today we were not. All three goals we could have avoided.
"They [Arsenal] are very good on the ball but we are a good defending team. There were not a lot of open chances. We made mistakes which we can't make. This game was decided by small details but also the decision making, that is hard to accept and we have to learn.
United opened the scoring through Marcus Rashford but allowed Arsenal into the game. Nketiah and Saka gave Arsenal the lead before Martinez restored parity.
However the Red Devils failed to hold on to their share of the spoils in the closing stages, allowing Nketiah to score the winner.