The former Italian football administrator believes the Partenopei do not need reinforcements in the January transfer window, as they are already on the same level as the BianconeriNapoli are as strong as Juventus and do not need to strengthen their current playing squad.
Walter Mazzarri's men trail the Bianconeri by three points in Serie A, and the former Partenopei administrator believes the good work done in the summer transfer window has left them with a team strong enough to challenge for major honours.
"I believe that Napoli should not do anything because the teams are built in June," the 75-year-old told reporters.
"The Napoli squad already has a sufficient size, and they are as strong as Juventus,"
Juve have drawn three of their last four games, and despite still leading the table, Moggi feels that the team's spirit might have been slightly disrupted by off-the-field events.
"Juve are nervous because of the controversy regarding [Antonio] Conte and [Giuseppe] Marotta, those are indicative of a state of nervousness that exists, as well as the fear of not being able to move forward as they would like.
"Juve are not as strong as they were a month or two ago.
"Probably missing [Giorgio] Chiellini, who gives them a considerable competitive spirit, and the lack of [Andrea] Pirlo are fundamental too, but this team does not score. [Paul] Pogba is a good player, but is not a phenomenon."