starters next season:
Buffon
Chiellini
Bonucci
Marchisio
Aquilani
Melo
Krasic.
Buffon
RB-Bonucci-Chiellini-LB
----Melo-Marchisio
--------Aquilani
Krasic-------------LW
-------striker---------
So we would need, as starters, two full backs, a LW (Elia would be sweat) and a striker (Lukaku can play this role, he does it also at RSCA).
As backups, we can keep De Ceglie, Grygera, Barzagli, Sissoko (if he wants), Iaquinta, Toni, DP, Manninger.
Get rid off:
Amauri, Legro, Rinaudo, Motta, Storari (he won't be interested in staying), Pepe, Martinez.
And finally, use some younger players as backups.