Manchester United's defence parted like the Red Sea to give Chelsea a precious 1-0 lead on Saturday, highlighting just how much work needs to be done by Michael Carrick - or his successor

There are two alternative angles of Morgan Rogers' opening Chelsea goal that are being played on a social media loop - and both make for an excruciating watch for Manchester United fans.

One is from Peter Bankes' Refcam. It is a seven-second horror show as United players appear to bounce off an invisible forcefield around the Chelsea forward. The other, from the Premier League's own account, makes it look as if Rogers is clean through on goal, such is the absence of United bodies anywhere near him.

Seven seconds, four mistakes, and two viral clips to add to the United locker of embarrassment this season. We break down what went wrong...

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Mistake 1 - Mbeumo

Bruno Fernandes played an aimless pass and Moises Caicedo's heavy touch saw the ball fall to Bryan Mbeumo's feet. He attempted to hold and shield the ball from Caicedo but he conceded possession, and so the move started.

Mistake 2 - Baleba

Carlos Baleba was the closest red shirt to Mbeumo. The midfielder tried to quickly win the ball back but was too slow to react and made a late challenge on Romeo Lavia.

The turnover left United in a difficult position. Leny Yoro was out of position having pushed up from right-back, leaving Rogers to run against Harry Maguire, Lisandro Martinez and Diogo Dalot.

Mistake 3 - Santos

Andrey Santos' role in Chelsea's opener is perhaps the most bemusing. He sprinted back when Rogers picked up the ball and managed to close him down to get to within a few yards, but what he did next was inexplicable.

The Brazilian attempted a slide tackle when he was a few yards off Rogers. It seems like Santos was trying to block a short pass from Rogers to Cole Palmer on the right rather than trying to tackle the man, but even if that were true, it would still have been the wrong decision. Refcam footage shows Rogers is firmly set on heading towards the United goal rather than playing in a team-mate, so Santos was trying to block a pass that was never likely to be made.

Once Santos had failed to stop Rogers' run, it was over to the backline.

Mistake 4 - Martinez

Maguire and Martinez have been disastrous as a pair this season and the goal sums up their form. There were no tricks or feints; Rogers simply ran through the gap between them.

Maguire had Estevao making a run over his right shoulder and so he could almost be forgiven for not dealing with the threat at hand, but Martinez has no such excuse. He had Palmer making a similar run over his left shoulder, but Dalot was there to deal with him. With Yoro out of position, Maguire could not pass on the man to his full-back.

Martinez failed to commit and Rogers soon had the whites of Lammens' eyes in his sights. The Belgium shot-stopper tried to stay as big as he could but the damage had been done. Lammens should have berated his teammates for their amateurish defending, but there was very little reaction from the goalkeeper as United found themselves behind once again.

If ever a reaction summed up the feeling around United right now, perhaps it was that.