Actually, I'm not sure if Fiorentina will accept this. Marrone, Quag and Matri will cost them 4m eur net in wages, which is around 6.5m eur if we include taxes. Jojo alone costs them less than 3m eur in wages+taxes. That's 3.5m eur more per year. In 2 years they spend the 7m eur cash we pay them (what Nzoric suggested). After that they are left with no money, a 31 year old Quag, 30 year old Matri and half of Marrone, while we have a 24 year old Jovetic.
As said million times, what Fiorentina want is money or players who'd bring them money when they sell them later. The rather oldish Matri and Quag with very high wages for Fiorentina's standards, simply aren't acceptable for Viola.