Who to buy for Fiorentina.

[Nando9]

Start of 3rd season and my squad looks like this-
gk- frey, boruc
lb- taiwo, pasquale
rd- de silvestri, vrsalijko
cb- subotic, gamberini, felipe, garay
cm- montolivo, moussa sissoko, biglia, bolatti
am- buonanotte, lljajic, vargas, jovetic, santana, rakitic
att- kadlec, gilardino, babacar

Any help on who to buy and sell will be helpful, thanks.