Not until Messi and Surez dip their form drastically, AND if they turn out to be good enough.
But again, that's exactly why Coman has been getting more minutes, because Robbery had been out, right?
Ribery and Robben wont be able to play a full season without injuries anymore. They will miss games, that's a sure thing. Signing a replacement was necessary for Bayern.
Costa and Coman are not only future signings, they are signings for this season. Pep will play both of them, even if Ribery and Robben are in full shape.
On the other hand, we dont need any replacement for Messi, Suarez and Neymar. If those three's are in full shape. They will play. We just need proper back ups. Those three upfront will be able to play at least for the next 2-3 years or longer.
Question is, whether Munir and Sandro will be happy to come from the bench and just be back ups. Question is, whether this will help their development or they will get impatient and ask to leave.
This is not the case regarding Costa and Coman.
This is what I wanted to point out.