It is their second successive Premier League defeat, their second in three games, making it the worst start in Jose Mourinho's career and the worst for the club since 1992/93.
Mourinho's side was shut out, 3-0, by Spurs, handing Man United its second straight loss three games into the campaign.
United has fielded five different players at center back - one being a midfielder, Ander Herrera, bizarrely playing out of position against Tottenham in a back three - in its last two games and conceded three goals in each of them.
Yet, Mourinho surely knows United is in a hole.
"Today played [Phil] Jones and [Chris] Smalling, but now Jones is injured, and next match it will be Smalling, with another one. I don't know my best back four".
Mourinho's position and mindset are being called into question, along with that of star turns such as Paul Pogba, and United need to offer a positive response when they return to action on Monday. "I care more about the result and as a team".
"I won more Premierships alone than the other 19 managers together", said Mourinho, irritated by the criticism of his side.
His dark mood has continued into the season. Then he got up out of his chair and repeated, "Respect".
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Ex-United captain Michael Carrick has moved onto the coaching team and is now sat next to Mourinho on the United bench.
José Mourinho retains the backing of the Manchester United board despite overseeing their worst start to a season in 26 years.
For a serial victor like Mourinho, results have always mattered more than the style of play.
Then, in one post-match interview, he insisted that his team actually had come out ahead in most aspects of the game. "You can see it. Jose Mourinho looks unhappy when this should be a dream job for him", Redknapp told Sky Sports.
As Mourinho walked away from the presser, he called out, "Respect, please".
United's defensive wall is cracking.
Perhaps the performance for the media was meant to show his defiance in the face of two defeats from the opening three games of the season.
However, former Liverpool defender and club legend Nicol has claimed that Spurs should not instantly be considered contenders for the league title this season and also added that they are not stronger than they were previous year.