I'm kind of worried about our defence for next season. Looking at it simply player by player, instead of it as a unit, It's pretty weak. Apart from Chiellini, none of the defenders are great.
Zebina can be great, but injury-prone and terrible inconsistent.
Grygera, had almost a handful of promising performances, but overall he is pretty average.
Mellberg is useful, as he can play both cb and rb. He is a solid option, but nothing special either. Not among the best cb's out there by a stretch. But i'm hoping (out of desperation) that he might surprise us.
Legrottaglie surprised us last season, but we all saw how he was without Chiellini. I still think he complements Chiellini well, but again.. kind of an ordinary cb.
Andrade is out, perhaps forever?
Knezevic is unkown quality to me, but is a rookie going by stats alone. One good Serie A season (apparently) only. He'd only play if Mellberg and Legro are out anyway.
Chiellini is class and will become even better.
Molinaro I think still has some potential. If he can improve some of his technical abilities (ball handling, crossing) and added to to the fact that he tries hard

p) he can be useful, but he isn't even close to a top- leftback.
De Ceglie is very promising, but the experience he has is one year of Serie A and the rest only at youth level. Very risky to rely on him.
So all in all, the fullbacks betray some fragility, while we lack one quality centreback.
I mean compare our attacking line-up, to our defensive...