Onana wants to leave Manchester United as soon as possible, citing dissatisfaction with Amorim as the reason. On the one hand, Manchester United has long needed to change its goalkeeper, but on the other hand, I don’t see them finding a worthy replacement for him, and another thing that needs to be paid attention to is that players leave their teams because they can’t find a common language with Amorim, this list includes Rashford and Onana, maybe Antony too.
It is definitely true that Onana can't be staying there, but at the same time we have a very limited time until he finds himself a team. United will not send him away for free, so he has to bring in some money for the club, and who would really pay that much for him? Considering how he has been in the last 2 years or so, we can safely assume that nobody will want him for that much money.
Some lower level team would be willing to take a chance on him and hope that he does good, like how Betis took a chance on Antony and it worked out, same could happen to Onana, some lower level team taking a chance, but that team can't buy him, just loan him. So I am assuming that Onana will go out on a loan probably and that would be a better deal for him anyways.