Ferlaino retained his role until 1993, with tho short interruptions in 1972 and 1983. Under his management, the club experienced one of the most successful spells of its history in the 1980s, when – also thanks to the performances of Diego Maradona on the pitch – Napoli won two Serie A titles (1986–87 and 1989–90), the 1986–87 Coppa Italia, the 1988–89 UEFA Cup, and the 1990 Supercoppa Italiana.