The Bianconeri need only four points from the remaining five rounds to secure the title.
"I think there can be no doubts over the penalty which decided a balanced game where we struggled a great deal," the Coach told Sky Sport Italia.
"Milan were unbeaten in the second half of the season and we travelling up the table. I must applaud my lads for the victory over a great team. We weren't happy with a draw and I know full well that stepping on to the field choosing between two results risks doing damage.
"Napoli had put us under a bit of pressure and we wanted to immediately break away again at the top. This is our sixth consecutive victory, but it is not yet the Scudetto winner.
"The players keep asking me how many pieces are left in the puzzle. Well, this was a big step forward. We want to finish the job as soon as possible so we can relax a little at the end of a hard season. I am concentrated on the target, because it would be extraordinary to win a second consecutive Scudetto and I'm very happy with the way the lads have performed.
"Seal it in next week's Turin Derby? I don't care where, when or against who, the important thing is that we secure the Scudetto. We know the dangers the derby holds, but step on to the field with the same hunger for success that the Granata will have."