Stefano Pioli felt Milan demonstrated their strength in depth in a 2-0 Serie A victory over Venezia at San Siro.
Pioli rung the changes following the draw with Juventus on Sunday, with Fode Ballo-Toure coming into a new-look defence for his first start.
The Rossoneri dominated possession but did not register a shot on target until Brahim Díaz turned in a first-time cross from substitute Theo Hernandez midway through the second half.
Marauding full-back Hernandez, who came on along with Fikayo Tomori and Alexis Saelemaekers just before the hour-mark, doubled Milan's advantage eight minutes from time as they moved level on points with leaders and fierce rivals Inter.
It had been a frustrating evening for Milan until Diaz struck with his third goal of the season but Pioli believes they showed the progress they have made, with key men absent once again.
The Milan head coach said: "The team broke [Venezia down] by playing a game with intelligence and clarity, continuing to push and create. We have more than one quality player and they are used to win games."
He added: "I disagree that we were not brilliant in the first half, just a little bit of quality was lacking. I am not surprised by the players who have not played much so far, they are all strong.
"Importantly, it means that the team is there and is fine, they believe in it [his approach] and play. We are only at the beginning, I have a very deep squad, apart from a few too many injuries at the moment. They are all players who can help the team."
Pioli knows there is plenty of room for improvement after his side made it four wins out of five games without defeat in Serie A this season.
"In the first half we lacked precision but we managed it in the second half playing with intensity and attention," he said.
"In many things you can improve. All the matches give us interesting ideas, there are many situations where we can grow "
Pioli revealed Zlatan Ibrahimovic, Olivier Giroud and Simon Kjaer are making progress with their recoveries from injury, but he is unsure if they will be fit to face Spezia on Saturday.
Hernandez became the first Milan defender to have both scored and delivered an assist in a Serie A game since Opta collected such data (2004-05), finding the back of the net with a sweet strike.