Mazzarri takes charge of Napoli for a second time after last week's dismissal of Rudi Garcia.
Bigon told Radio Kiss Kiss: "Mazzarri is really excited for his second adventure in Naples. I heard from him and I can confirm that he has great spirit to face these first days.
"On the form I can tell you that the coach has always been a tactical maniac, and he doesn't have a single rigid idea. In the years in which the three-man defence was back in vogue, he had understood that that method could be strong and he was one of the first in Italy to have success with that type of system. But he continued to study and update himself, and every time I visited him in the past we always talked about new trends and how much football was changing.
"He will have no problems adapting to the 4-3-3, he will have no difficulties in defence, even if it will take time because he is attentive to details and will want to explain his ideas well to the players."
Bigon also said: "And then in my opinion Kim's absence is heavy, therefore a bit of difficulty in offering the same football as last year. But the team has great players, it is high profile, so with Walter they will be able to get back up from this difficult moment. Taking away the people on the staff, with whom he worked the most, I know well how he coaches and his deep relationship with the players because I won 7 championships there. His teams have always run from start to finish, and this time too it will be like this even if it takes time, and will also depend on the right predisposition of the players.
"If Napoli and all the players have the right hunger, then it will certainly work, but it depends on the availability and the right spirit of the protagonists."