All three of those players have a value of around 25-30m each. I can only see the top English and French teams spending that kind of money. Key opportunities might come from those clubs selling existing players to fund them. Names that could be for sale are Mata, Nani, Pastore? Not sure Juve is interested or can afford those either.
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On Nani. IF it is true that Conte is asking for Nani, then that is interesting because I am not sure Nani is the type of player who can play well as a wing back (maybe conte thinks so? no idea). He is clearly an attacking winger (who can play on either side). My guess is that within the 352 he would be more useful as an attacking forward behind the striker (i.e in a 3511) or in a 343. With a 4 man defense clearly he is at home in a 4231 or 433 formation.
Whether its Nani or not, I think it would be wise for Juve to have a natural attacking winger in the squad - Giaccherini was originally that kind of player as is Pepe. With the squad we have right now, we can only realistically play with a 3 man defense. Yes I know, why change a winning formula....however, the point is we have NO choice but to stick with it now. Having a player that can adapt to the 352 but also be effecting as an attacking mid/winger would be ideal to have in the squad.