I'm not a big fan of co-ownerships, but if that means we can keep Zaza, Berardi and Poli away from Milan and Inter that's good enough for me.
Zaza & Poli co-ownsherip bundle from Sampdoria for about 8M for 50% of each. Berardi co-ownership 3M for 50%.
I don't think we need a CB anymore. Caceres can play as a LCB and a RCB. Peluso can play as a LCB, Lichtsteiner can play as a RCB and Marrone can fill in for Bonucci.
Get those youngsters, and get Sanchez on loan for 5M.
16M spent and we'd be great.