Erik ten Hag has called upon his Manchester United team to learn from their 'unacceptable' defeat at the hands of Chelsea on Thursday night.
The visitors had stamped out the Blues' two-goal lead in through goals from Alejandro Garnacho and Bruno Fernandes by the time the whistle blew for half-time, and a second goal from the former in the second-half all but sealed victory on the road after the weekend's draw with Brentford.
But a late penalty conceded by Diogo Dalot handed momentum back to the hosts, and after Cole Palmer levelled from the spot in stoppage time, the boyhood United fan heaped yet more misery onto the Red Devils with a matchwinner struck just 82 seconds later.
Defeat on the road calls into question Man United's on-going quest for a spot in the Champions League places, with the side rooted to sixth place - and currently out of contention - on 48 points.
But despite his disappointment, Ten Hag was also keen to stress that he believed his side, who had led for large swathes of the second-half, deserved to win.
Erik ten Hag stressed that his side deserved the win on a dismal night against Chelsea away
The Red Devils led for much of the second-half but conceded two late goals to hand the Blues all three points
Cole Palmer's stoppage-time winner sparked scenes of mass jubilation amongst the hosts
'It was for the neutral an amazing game. A fantastic football game with a lot of quality,' Ten Hag told BBC Sport after the final whistle.
'Manchester United dominated the game but we made individual errors that cost us the game.
'We have to learn from it. When you are a Man Utd player you should already know how to deal with this circumstance.
'I enjoyed how my team were playing, it was fantastic. We dominated the ball, we dominated the opponent.'
But, Ten Hag added: 'In five days we dropped five points. That is unacceptable. We should have a high standard if we want to compete for Champions League football.
'I don't know (if the top four is gone). I have to see again the ranking. Points will be more expensive. It's very disappointing we're doing this and making the wrong decisions. We gave away a game we should have won.
'As a team we should deal with this.'
Speaking to TNT Sport, the Dutch manager conceded that the side had started 'poorly', only to grow into the game.
Alejandro Garnacho scored twice in a mostly dominant display but his efforts weren't enough
Noni Madueke (pictured) was felled by Diogo Dalot and picked up an injury-time penalty
'You saw we were dominating the game and it was brilliant how we played - we deserved to win the game.
'But, you cannot give it away like we did and we have to manage this game better.
'It is a team performance, you can point to one of the players but it's about a team performance.
'When it gets chaotic you have to deal with it as a team and we made the wrong decisions and we didn't help out as a team.
'Out of possession we made bad decision - a lack of concentration.
'Also, I think lucky at the end with the penalty situation, questionable and very soft but we have to do better.'
Ten Hag's future will likely hang in the balance if Man United are unable to secure a place in Europe's top flight next season.
But ahead of Thursday evening's clash, the manager had pleaded for patience with his 'process' from new minority owner Sir Jim Ratcliffe.