The cameo felt symptomatic.
The midfielder, who burst onto the world stage during his stint with Serie A giants Juventus, dominated the midfield under the floodlights at Old Trafford on Friday night.
United used to be about the collective, the team: the Busby Babes, the Trinity, Fergie's Fledglings, the Treble-winners, the unity and, amid occasional meltdowns...
Pogba, who was given the captaincy by Mourinho on Friday, summed up what it meant for him to be happy and comfortable.
"Fred was a good signing, he has fitted in straight away.
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There are things that I can not say otherwise I will get fined", commented Pogba.
"The problem was last season a lot of the defenders were injured, he had to swap and change a lot", the 38-year-old added.
Mourinho has been responsible for some of that, including big-money deals for the likes of Paul Pogba and Romelu Lukaku, but he is considered to be making amends for his predecessor.
The flashy midfielder, who had two stars carved into his hair to denote Les Bleus' two World Cup triumphs, demanded the ball at every opportunity and breezed past Leicester players easily.
Pogba excelled for France at Russian Federation 2018.
The new arrival was energetic, snappy and tenacious when winning the ball back and more often than not, he was looking to pass to his midfield partner. Nonetheless, he is still viewed as an option for the Red Devil.
A report from RMC claims that Pogba instead wants to remain at Old Trafford, and become a leader for the next generation.