~snip~
Bilbao will lose their valuable asset but they will also benefit from the sale of this player which is clear that Barcelona really wants this player because Barca feels that the combination of Lamine Yamal with this player will be very suitable for next season in deepening their strength as they work together in the European arena so that brings Spain won Euro 2024 thanks to their performance and I think Nico Williams will also be happy because he will join his colleague at the same club.
Source : Lamine Yamal and Nico Williams
Of course there will be many team see his potential and want to have Nico Williams, just like Barcelona which is currently starting new season with new coach and of course has efforts to utilize summer transfer window.
Moreover, he also performed well and there have been many big changes in his development during these two seasons playing for Bilbao, I sure that move to big team can improve his quality and playing skills significantly in the future.
But seeing as several rumors circulating are all still related to Barcelona financial problems, to be honest I haven't found any clear certainty about what the future holds regarding this transfer option.