Thomas Tuchel was unhappy with his team after his poor performance against Bordeaux (2-2) on Saturday.
The German coach had decided to make several strong choices, in line with his internal anger, in order to move the lines.
By preferring Diallo to his two left-backs by trade and Moise Kean to Angel Di Maria, he jostled his team.
"Manchester will close the spaces, it's almost impossible to find inside, which is the strength of Angel, justified Tuchel before the kick-off on RMC Sport.
We want to find spaces in the depths.
It is the strength of Moise, who fights with the exchanges.
It's not a choice against Angel, but for Moses.
They have different characteristics.
"
Tensions with Di Maria
The first goal proved the manager right, first.
The Italian striker pulled his team forward and made a call by mobilizing the two center-backs, freeing up space for Mbappé's percussion and Neymar's goal.
In weak times, on the other hand, Paris lost control, of course.
And we never saw Kean again, quite simply, until his replacement by Bakker (65th).
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It was the first time that Di Maria did not start a Champions League meeting since the arrival of Thomas Tuchel.
The Argentinian did not even come into play. A choice linked to his physical slack, to a form of mental decompression, perhaps, while he finally made a return to selection that he expected so much.
The tensions between the two, which arose from Di Maria's exit last week when he was replaced by Rafinha against Leipzig, arguably did not help either.
Tuchel has decided not to suffer
Abdou Diallo's record was very mixed until his instinctive decisive pass on the liberating goal of Marquinhos.
The defender replaced left side, who had tactically prepared a possible replacement for this post in recent weeks, showed envy but showed gaps in the centers.
Above all, his lack of automatism has undoubtedly earned him a few tenths of delay which allowed Rashford to score - again - against Paris.
This choice was all the more surprising given that Kurzawa was working with the other holders of the defense the day before the meeting at Old Trafford.
A disavowal, too, for the young Mitchel Bakker, aligned these last two games.
By maintaining Marquinhos in central defense and replacing Danilo Pereira in the post that everyone knows him, that of sentry, Thomas Tuchel also acknowledged the failure of his experiences at the start of the season.
The decisive performance in central defense and the goal that gave Paris its destiny back illustrate his confidence and influence in this position.
It wasn't all perfect, but Tuchel, at least, decided not to suffer anymore, as his move to 3-5-2 on the hour mark illustrated.
At 11 against 10, Paris no longer trembled and the Neymar-Mbappé team, even half charred, offered PSG the goal which promises them first place except for an accident against Basaksehir.