sell Robinho and sign players like Adryan, Wellington Nem, Fierro, Erick Torres, Sanchez Miño who has Spanish nationality (on loan with buy option),Thomas Drage (the potential of this guy is different from one save to another, i think that he is a -8 and could be good or bad, check on Scout), Yttergard Jenssen
Remember that you can only buy 2 non-eu players playing outside of Italy.
Every player I said above could be key players in 2 years or less (W. Nem is a beast from the very beggining) and you wanna sell them later you could do millions of profit...
In a Newcastle save that I play I bought Drage for +/-1M€ and he plays like 1600 min and the season after I sold him for almost 10M€...
If you think that the money from Robinho is not enough think of selling Boateng, I know that he´s a beast but has high injury proneness (15/20, i think so)...