What I know is that Ruben Amorim will listen to every offer that comes in, and that means if there is an offer for Onana, I think Amorim might sell the Cameroon goalie. But it also does not preclude the possibility that Amorim will buy a new goalkeeper without having to sell Onana first, because as far as I know that Sir Jim Ratcliffe is aiming to sell his other company (OG Nice) and he will be used to fund Man United. If that really happens, then Amorim will most likely get quite a lot of financial support.
I am sure no team is interested in bringing Onana at the same price or close to what Man United initially recruited him.
Regardless of whether Onana is still in the team or not, it is only right for Amorim to bring in another goalkeeper because last season we could see that Onana did not perform well and not only that, Amorim must also get full support from the team management to build the Man United team if they want to be better next season.