The mistake at MU has shifted from midfielder Harry Maguire to goalkeeper Andre Onana this season.
You have a point because one of the major issues with Manchester United is there midfielder and goalkeeper, although in times Manchester United goal goalkeeper, De Gea was just the goalkeeper that really understand the actual pattern of Manchester United I don't no why they decided to sold him when there problem was not from the goalkeeper but I believe they now understand how important De Gea was to the club.
and even there current goalkeeper Onana is not helping Manchester United at all, but considering his performance on AC Milan I was even thinking his performance on Manchester United will be same as when he was at AC Milan but it was quite the opposite, but however if Manchester United should work on there midfielder there could be more chances of getting back to there former performance.
When he was at Ajax and Inter Milan, we all saw the quality of Andre Onana. Yes, he is a good goalkeeper. But somehow when he moved to Man Utd we could see that Onana seemed to have lost his ability as a good goalkeeper. The mentality of a world-class goalkeeper like Onana should be that he can maintain his performance wherever he is.
But now I'm starting to think that maybe the real problem is Man Utd's back line itself. Last season, De Gea was also considered to have experienced a drastic decline. And this right could be that the problem is not with De Gea but with Man Utd's back line itself. So the goalkeeper who cannot save the goal is then blamed.
I feel that Man Utd really have to make big changes next season if they don't manage to get good results this season.