The next destination of Nico Williams is not clear yet and we can't make sure if Nico Williams will stay in Bilbao or if he is going to leave. Recently he posted a video supporting his team and people said he was forced to do that and some other people think he will stay in Bilbao until he ends his contract.
The last news about Nico Williams and his situation is about this player being absent in the game they are going to have in Germany against Stuttgart and it seems Ernesto Valverde doesn't want to use this player anymore because of the rumors about him leaving the team.
In some media that I read Bilbao will keep Nico Williams until his contract ends.
But this also does not rule out the possibility of releasing him if they get an offer like they want. Nico Williams has managed to attract the interest of several big clubs after performing consistently with the Spanish national team and now Barcelona wants him to join them the most.
But because of finances it makes it difficult for Barcelona to make an offer with the club where he plays.
This is still speculation and there is no clarity before it is announced, but I am sure he will stay in Bilbao at least until next season.
Now is not the right time for him to leave because he needs more playing time to improve his individual skills.