I'll be frank mate, I cant see Juventus spending big at all. Their chairman has recently been bemoaning having to spend big fees, and saying the top cubs should abolish fees. The Italian league is older, slower and more tactical than the others in Europe so rewards older players, which are very cheap now anyway. I really don't see Juventus wanting to plunge a big fee though a creative swap(s) could really work (see Kulasevski, Rabiot or Costa). I don't see Aaron Ramsay coming here, but some of the others, maybe?
As for PSG it's a strange one isn't it? They have mega money though. Maybe if they tie Mbappe down it reduces the need. I think FFP will not be in operation this summer, but they are trying it on. If we want 50m they will be able to pay it, it's a case of if they want to. In fairness, nobody really knows whats happening this summer. The amount of money coming out of the market and the impact on fees, and what will happen with GFP (from abolishment at one end, to another postponement at another). So I think you will see alot of standoffs between clubs where it's hard to value a player.
Everton though, can't really afford to just let the player go on loan again. We have 3 assetts in DCL/Richarlison/Kean and I can't really see a world where 1 of them can't be sold this summer.