A late Marcus Rashford hat-trick meant Manchester United smashed the Bundesliga leaders 5-0 in a Champions League group game on Wednesday night.
Manchester United led 1-0 from a Mason Greenwood goal in the first half, but the game was in the balance until Rashford came on in the second half and smashed in a hat-trick in the last 20 minutes, with Anthony Martial also bagging a goal.
Nagelsmann believes the defeat looks worse on paper due to the scoreline, but conceded that his team completely stopped defending once the second Manchester United goal went in.
He admits that it is hard to go back to Germany with a 5-0 defeat beside their name, but feels his team will take the lessons from a chastening night at Old Trafford.
Nagelsmann said on DAZN: “The result doesn’t feel good and it reads more emphatic than it was.
“After going down 2-0, we stopped defending and to fly back home with a 5-0 loss is some feat.
“A 2-0 defeat would have simply been a loss.
“We paid dearly and we have to learn from it.”
Manchester United are sitting pretty at the top of Group H with two wins from their opening two games.
