Nonetheless, fans are hardly concerned with where his loyalties lie now due to the convincing win over Chelsea but also because the English transfer window has slammed shut and it's hugely unlikely United will now sell without being able to bring in a replacement.
But while the crowd celebrated their new-look side's flawless start, it was evident until Martial made it 2-0 in the 65th that there is still much work to be done to get United anywhere near the level of title favourites Manchester City and Liverpool.
United have kickstarted their season in the best way possible after thumping Chelsea 4-0 at home.
Pogba considers that to be the case, telling French reporters after a positive opening to the 2019-20 campaign for the Red Devils and their big-money addition: "I call him "The Beast". He is a leader.
For all the chaos which flooded Mourinho's final season in charge of the Red Devils, it's easy to forget that it actually got off to a good start in the form of a 2-1 win over Leicester City and a certain Harry Maguire.More news: Perseid Meteor Shower 2019: How to see it in MI this weekend
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"Our changes enabled us to take over. They pinned us back and created chances, but we settled a few nerves [in the second half]". "At 1-0, we were the better team, but I can't stand here and look happy with that". "We are satisfied with our performance".
Abraham and Emerson struck the frame of the goal before half-time and Chelsea played some attractive football until United's powerful counter-attacking play exposed the away side's defensive weaknesses.
Ole Gunnar Solskjaer's men were in need of a fast start to the campaign to erase memories of a bad end to last season and got it, as Rashford's early penalty and three goals in 16 second-half minutes from Anthony Martial, Rashford and debutant Daniel James had Old Trafford in raptures. He's a World Cup victor, he's come so far in his career and there's no point letting yourself down.
He added: "I can't drag people out of the medical room to play".
"It does not bother me where I play, whether it is higher or lower, we adapt and enjoy. We moved it nicely second half and our front three are so unsafe on the break", added the centre-half. We try to do a maximum number of passes like that. They snapped into tackles, looked calm defensively and even though Chelsea caused United problems defensively, it was more so down to Luke Shaw and Victor Lindelof being caught out of position or sloppy passes in midfield.