Mourinho's punishment, if found guilty, could include a touchline ban, which would mean him sitting in the stands for the game against his former club Chelsea at Stamford Bridge on Saturday.
The 20-time English champions have lost to Brighton, Tottenham Hotspur and West Ham in the current campaign to heap pressure on Mourinho at Old Trafford.
"The problem they have is that they both put themselves into that Messi-Ronaldo bracket by getting close to the goal-a-game level last season", Fowler told The Mirror.
"We were winning the game 1-0 at the time of the video".
And things worsened following United's shock exit from the 2018 Carabao Cup when a video emerged of Pogba being confronted by the Portuguese manager. He asked him why that happened. But it's like, I have nothing to do with it. Mourinho gave me a chance, he said to me, "I want you to stay here".
"I do think they (United) miss a couple of real class players that other top teams seem to have - a link player and also a controlling midfield player", said the ex-midfielder.
Former England worldwide Scholes believes their rivals are revealing in Manchester United's misery under Mourinho.
"I know he has qualities and has been a good player but I never saw him as a United player", Scholes said in an interview with ESPN.