I hope Barcelona finalizes the sale of Roque as soon as possible to raise some funds. If Nico Williams is really staying at Athletic Bilbao then they would look for another alternative. They just can't finish this transfer window without making a proper transfer to the attacking line. Raphinha isn't a reliable player. They need a more consistent winger to the left side.
But I can't see anyone else rumoured as a Plan B in case of not being able to sign Williams. Have you heard any?

Hansi Flick has come in a really tough time so I'm really curious how good he will be able to handle this Barcelona.
Flick didn't come at the most difficult time, if you look at the situation in which Xavi came to Barcelona, then it was much more difficult for him because he had to assemble a team when Barcelona's results were much worse. And now Barcelona looks like a team, and only a few positions need to be strengthened, so Flick has much less work to do. Xavi worked in exactly the same situation, when the team was going through difficult times, and there was no money. Flick said that he does not need new transfers, but despite this, they want to get Nico Williams.