Napoli are not going to sell all their stars.
They are trying to improve, they know that they will eventually sell some though.
I think that they will sell Lavezzi first, is he can be replaced easier, since the market has more creative dribblers than prolific finishers.
Do they see in Giovinco a decent replacement?
To sell Cavani they would want the cash to get a replacement they might have in mind and make some extra profit too.
Considering their target, that would be harder than it looks, for reasons that go beyond our perception (like waiting euro 2012 to end before they get him for ex)
After we have Giovinco in our hands, we will knock their door back and see what happens...