Souness believes that Mainoo, while undoubtedly talented, should be playing a rotational role as he matures and gains experience.
"Mainoo right now should be a player that's flitting in and out of a good team - not coming in and being asked to stand up and play against the very best teams," he said. He might be a player one day, but he's certainly not the go-to man at United like they're making him out to be in midfield. They got ran over, they were not in the game yesterday."
The numbers support Souness’s argument, as Mainoo’s appearances this season have coincided with a string of poor results for Manchester United. Out of the four games he has played so far, United have lost three, including the Community Shield defeat to Manchester City.