Both teams performed admirably against the two Milanese sides that are considered giants in Italian and continental football.
Juventus recorded a 2-0 victory over AC Milan courtesy of two late goals from Claudio Marchision while Napoli eased past Inter Milan in a 3-0 win.
Lippi felt both teams signalled their intentions with the results, but refused to rule out
"I think Juventus and Napoli will both fight to win the title this season," Lippi told Ansa, "However, Milan, Inter and Udinese are also there. Udinese never cease to amaze me."
Lippi also continued to speak about about Roma, who are also usually considered as one of the favourites in the running for the Scudetto.
He added: "Roma have an excellent project and champions like Daniele De Rossi and Francesco Totti."
Juventus are joint top of the league with Udinese, one point ahead of Napoli.