After seeing yesterdays match, I think getting a fullback is more important than a CB .
Molinaro, Zebina, Grygera, Birindelli? Not worthy of a big club.
Molinaro is 24, so it's not like he'll improve drastically. He is a limited player, did ok with Siena, but we're Juve.
Zebina, our most decent option for RB. Ok player, but makes mistakes and sometimes loses his temper. I'd play him for now.
Grygera. Decent free transfer, but not a starter in my book. His defending is just enough and he brings nothing forward. Second choice RB...
Birindelli. Respect to a big clubman, he offered us a lot in the past and still has something to offer as a decent versatile solution, but we can't rely on him for 90'. Keep him of course, but play only when needed.
Conclusion?
We do not have a single quality full back. Not on the left nor on the right. That was the biggest difference against Inter. Maicon and Chivu were great to stop Palla and Nedved, and Maicon even got close to goal, whereas Figo and Cesar were very free and no fullback created a chance going forward.
Chiellini must be played in the center. His match of yesterday was a big scream out loud "I'LL RULE THE CENTER!!". Partnered with a smart and calm experienced player (Andrade. Leggro can do until he comes back) he will flourish.