The Nerazzurri earned the 2-1 win at San Siro, leapfrogging the Partenopei into second place.
"We are happy to have beaten a great Napoli side," he told Sky Sport Italia.
"We will battle with them to the end of the season and are so pleased with an excellent performance.
"Of course I am happy at scoring a goal, but above all for the victory. These are three truly important points for us.
"Are Inter now the anti-Juventus? It's not easy, but these games give us the belief to fight all the way. We know that we can fight for the Scudetto."