Former AC Milan coach Arrigo Sacchi believes his old team remains on track to win the Serie A title.
Milan are top of the table in the final stretch of the season.
Sacchi said: "Milan, we have said it a thousand times, is not the strongest. And deservedly are in the lead, but it is a young team, it lacks the necessary experience and the calendar does not help.
"(Stefano) Pioli knows that he must focus above all on the collective because only by doing so will the individual players never feel alone and will do more.
"Napoli played a great match in Bergamo. They impressed me with the pace, the ideas and the tests of two elements in particular: Lobotka and the young Zanoli. Now they must demonstrate that they always have this quality which is fundamental in the fight for the Scudetto."