what we should do (dream version):
exchange fabregas for ozil, sanchez for reus. add a bit of cash if needed or even players like tello/sergi roberto.
sell song, afellay, cuenca, dos santos, oier and bojan, if the latter is still under barca's contract.
loan tello and sergi roberto if these two aren't included in ozil/reus deals.
let valdes, pinto and puyol leave, unless pinto has a contract, then we can sell him too =D
promote masip and maybe some other barca b player who is promising, like traore.
bring back rafinha, if the coach intends to bench xavi more.
keep deulofeu on loan for another season.
buy hummels, another CB laporte or luiz or both if we can't buy the borrusian player and maybe add a forward like mandzukic or jackson martinez if we ever try to play with plan b, c or whatever
================mats/masip=====================
alves/montoya===pique/laporte===bartra/hummels===alba/adriano
=====xavi/alcantara==boss/masch===iniesta/ozil===========
===traore/pedro======messi/fw=============neymar/reus
that's 22 players. we will have a third gk, and a couple of other players.
we should keep tata and let him not xavi/board run things.
we can even keep sanchez and get reus instead of buying a typical forward, i'm actually against of. pretty strong squad if you ask me, way more versatile than the current squad, with way more depth, and it's not impossible, but nothing like this will happen unfortunately.