In the Prem, two players I like are Ake and Diop. You could also throw in Alderweireld's name into the mix as a much cheaper option, and could play stop gap while Tuanzebe gives it a go.
If we're to look further afield, we're gonna take more of a punt, but a few names to throw into the hat would be;
Ruben Dias - Risk being a fee of around 50m and we've had some bad look from Portugal lately
Upamencano - Young, at a club that doesn't really need money, so probably looking around the 50s again, but at his age, inconsistencies are still there.
Cesar Montes - Young Mexican lad. Not seen a great deal of him, wouldn't cost loads and has done well, broke into the Mexican side so maybe worth a punt
Thing is, I'd rather Maguire, but you have to have cut off points. We can't give into the demands of every club or we'll be seen as a club that will.