The truth is the only way we get Sanchez (or a Neymar) is if Aguero or Sterling are leaving.
As much as I have talked about Aguero previously not playing to Pep's standards in the new system, he really came around in the last few months and I have come back around to thinking he can contribute (beyond goals) to our play next year. And I think Sterling is really undervalued on here and is still developing into a top tier player (maybe not world class but definitely of the quality we require for our squad). Pep needs both world class and very good talent that fill very specific roles (whilst also being positionally flexible) for his system to function correctly and I think the new Aguero and Sterling tick those boxes.
I don't really want to lose either player to accommodate another name brand.