why?

I guess you could say Zlatan is not that young, so you have to prepare for the future, but since it seems they're going to buy a shiny new striker every summer regardless of who's on the team already, that doesn't really make sense.

in any case, assuming they play with two defensive midfielders (Blaise + Verratti, or maybe Cabaye since they're reportedly looking to sign him too) and that both Cavani and Ibra play (Blanc already declared they had compatible profiles), that leaves 2 spots open for Pastore/Menez/Lavezzi/Lucas. I know Menez' agent must be getting busy right now.

still after Lucas Digne for left back (that'd be good)

as for Silva, I don't think they'll let him go this year at all, but if they do, it won't be for 32 mil. Barca is going to have to up the ante if they really want him (they may be able to use the MU money they'll be getting for the other Thiago).