One of the major problems Manchester United is facing is not having a better goalkeeper, and the performance of Onana as Manchester United's goalkeeper is nothing new; he has not been performing at his best. I think the team would be better off if they got a new goalkeeper. Onana has made so many mistakes that have caused Manchester United to fall behind.
If there were a good goalkeeper, I don't think Manchester United would be in the position they normally end up in at every competition. However, I believe Manchester United will still want to retain Onana, believing he might improve and become consistent in his performance.
I'm not really sure if Manchester United really look at Onana contract before they signed. Could it be because of his performance in the Champions League with Manchester City and Inter, I'm not really sure but $150k a week is a very huge amount for Onana judging him from his performance, that payment isn't worth it if we are to say the truth about what guy has been putting that club in the last two years and the problem now is no club is willing to take him as loan.
Unless he is ready to cut down his pay, nobody will want to hire a goal keeper that is really bad like Onana and be paying him huge amount of weekly payment. With additional of 2-3 years remaining, the club just have to endure whatever comes their way or they accept their loss and bench him with a replacement, maybe that is going to put the team in the top place. This is the same faith with the likes of Maguire, no club is willing to pay huge amount of money to buy these guys and I don't blame them.