The Blucerchiati are still unbeaten with three wins and two draws to sit in third place despite their one-point penalty in the betting scandal.
Ferrara said: "Napoli have certain characteristics and so do we. It means leaving space to their three stars or to our rapid attacking players could change the game.
"Admittedly, facing Napoli cannot be a game like any other for me, considering my past. It is also true that Walter Mazzarri gave me problems when I was Coach of Juventus, but this is a different matter.
"I asked the lads for courage and the same cocky attitude shown in other matches."