In fact, Die Roten have backup goalkeepers like 34-year-old Sven Ulreich and 19-year-old Johannes Schenk. even so, it looks like Bayern Munich wants a goalkeeper who has almost the same quality as Manuel Neuer. and the first candidate to replace Neuer is, Alexander Nubel. in fact, Nubel himself is a Bayern Munich goalkeeper who was loaned to AS Monaco. Bayern has a clause to repatriate him. however, the situation was getting more difficult considering that Nubel himself did not want to return to the Allianz Arena as long as Neuer was there because he did not want to just be a back-up.
That's why other names have sprung up like, Yasin Bounou, Livakovic, Yann Sommer who plays for Gladbach, even the latest rumor is Emiliano Martinez. however, so far neither one has actually signed a deal with Bayern Munich. although actually, Dinamo Zegreb or Sevilla. has responded to the needs of Bayern Munich. it's just that, so far there has been no official statement regarding who will replace Neuer later. so, we will just wait until there is an official statement from Bayern Munich.
Nobody wants to be Neur's back-up at Bayern Munich, especially if they are currently the first choice of coaches in their previous team. Obviously Neur is not yet to be replaced at Bayern Munich as the main keeper, so I think it will be difficult to get a top keeper if they don't guarantee a place. Neur may face the reality of not being the main keeper at Bayern Munich anymore due to age, but I'm sure he will still have his place during this season and the next season if his form is still good.
A good scenario to convince another goalkeeper to come to the Allianz Arena is to guarantee a place regardless of that in the league or the Champions League. Or the best consequence is getting a young goalkeeper who is still willing to be a back-up for several seasons.