The moment is optimal to switch Man Utd's system - the manager insists.

Head coach Ruben Amorim contends that switching Manchester United's tactical system due to public noise would have meant "the end" for him.

In a first against Newcastle, Amorim abandoned his trademark back three setup with wide defenders and instead field an orthodox four-man defense shielded by two defensive midfielders.

By his own admission this ultimately functioned as a six-man defensive block in the closing minutes as his side held on for a win - securing just their second-ever clean sheet of the campaign.

Although he once famously remarked that even the highest authority could compel him to adjust his approach, Amorim insists the capacity to play with varied formations has always been part of his long-term vision.

Yet, he emphasizes he could only make the switch when his team were performing well enough - or else it would appear as if he was giving in to external criticism.

"When I came here last season, I understood maybe I lacked the players to perform effectively in that formation, but it was the commencement of a journey," he said.

"We were trying to build an style. Currently is a different time. We lack a lot of personnel, and we have to adapt, so they see why we are changing.

"This isn't because of the pressure of the media, or the supporters.

"When the press talk about changing the formation all the time, I cannot change because the squad will think I'm altering things because of external voices and I feel that is a disaster for the coach.

"When we are playing well in our system, that becomes the opportunity to adapt.

"This will help us grow into a better squad because when our full complement of personnel are available, we are not going to employ a back three all the time."

Squad Challenges Loom Large

With just two victories in eight games before beating Newcastle, it is debatable whether Amorim is accurate to claim his team have been playing well.

He is, nonetheless, managing with a depleted squad, with seven senior stars already unavailable for the upcoming fixture against struggling Wolverhampton Wanderers.

That number will rise if playmaker Mason Mount is unable to recover the injury that forced his withdrawal from the Newcastle game at the interval.

Skipper Bruno Fernandes is among those who will miss the Wolves match, despite the fact he is reportedly pushing his manager to allow him to return following his hamstring injury.

"Bruno is already telling me he needs to practice," said Amorim. "But there is no chance he is going to feature against Wolves. No way. You can quote me on that."

The Captain's Leadership Is Unwavering

Nevertheless, the Portuguese star will probably still be deeply engaged, as while most unavailable players view matches from the stands, Fernandes was observed monitoring the pre-match routines from the mouth of the tunnel before the Newcastle game.

Amorim anticipates his leader to continue offering input.

"The guy is a leader," he stated. "He must not be that guy that when he is absent, he's not talking and speaking. He's constantly communicating. That's why he's the skipper.

"He has bad things at times - the way he gesticulates - but he has a lot of strengths. Even after he finishes treatment, he heads to watch the rest of the squad training. There are a many aspects that go unnoticed.

"I'm not sure if he desires my job or not, but he's a leader. The guy is a leader."

Return Timeline for Injured Personnel

Although the exact timeline for the captain's return - and that of fellow unavailable stars like Kobbie Mainoo, Matthijs de Ligt, and Harry Maguire - is unknown, before the conclusion of January, United will see the return of Noussair Mazraoui, Amad Diallo, and Bryan Mbeumo from continental competition.