Louis van Gaal's side gave up a lead to lose 5-3 at Leicester City in humiliating fashion. Here's how the players rated...
David De Gea - 5.5/10
The Spaniard looked lost as Leicester put goal after goal past him. Should he now start to take responsibility and sort his defence out?
Marcos Rojo - 4/10
Rojo struggled badly as Leicester ran riot down the right-hand side. Will need to improve vastly if Manchester United are to have any chance of not conceding several every game.
Tyler Blackett - 5.5/10
Usually one of United's better performers this season, the young defender was sent off late on after conceding a penalty. Not even he could spare his defence's blushes today.
Jonny Evans - 5/10
The centre-back came off injured after half an hour but still managed to look unconvincing during his time on-field.
Rafael - 4/10
The second of Manchester United's South American full-backs to struggle at Leicester, having conceded the penalty that swung the game in the Foxes' favour. Yes, the referee should have given a free kick for the foul on the Brazilian - but why on earth did Rafael react by running into the box and committing a foul himself? It was reckless, irresponsible and downright stupid.
Ander Herrera - 7/10
In midfield, things looked better for United, even if their midfielders and forward didn't track back enough, leaving their defenders isolated. Spaniard Herrera did well for the most part and scored with a fancy flick to put his side 3-1 up.
Daley Blind - 6/10
Another summer signing, Blind, did not fare so well, however, as his job is to protect the defence. Did he do a good job? The scoreline suggests he found himself a little overwhelmed...
Angel Di Maria - 8/10
When Di Maria was on song, Man United were in complete control, while his goal (United's second) was a thing of absolute beauty. He surged from within his own half and produced a chip past Kasper Schmeichel that many are already discussing as a potential goal-of-the-season contender. Check it out if you haven't already!
Wayne Rooney - 6/10
Louis van Gaal says he considers his captain a certain starter but, on recent performances, you have to wonder why. Despite an assist, Rooney was wasteful with his passing today and bellowed at his defenders when they conceded goal after goal. But how about showing some leadership beforehand instead of reacting petulantly after the event?
Radamel Falcao - 7/10
Some felt the Colombian's influence waned as the game progressed - and he did fall down comically while on the ball in the second half - but Falcao more or less delivered on his first start for Van Gaal's side. Indeed, he provided a pinpoint assist for Robin van Persie's opener and hit the crossbar when United were in the lead. Had he put that chance away, though, his side would have been well clear...
Robin van Persie - 7/10
Criticised for not doing much after his goal, Van Persie essentially did what every classic no.9 will - put the chances he is presented with away. Falcao sent in a wonderful cross at 0-0 and the 'Flying Dutchman' headed it home. Little in the way of service came thereafter - so what was Van Persie to do?
Chris Smalling - 4.5/10
The 24-year-old did no better than Evans and serious questions need to be asked of his current form.
Juan Mata - 4/10
Was introduced late in the second half and was culpable for one of the goals. Hardly the right way to go about showing your manager he was wrong not to start you...
Adnan Januzaj - 6/10
The youngster came on four minutes before Mata but didn't really influence the game. In a way, that's a good thing - as at least he didn't influence it negatively.