The team is one of the form teams in Serie A, and the forward believes they could have been title contenders
Ibrahimovic returned to Milan – where he previously won the Scudetto in 2011 – as a free agent in January after leaving MLS and the LA Galaxy.
The 38-year-old striker is still having an impact in Italy’s top flight .
Ibrahimovic told DAZN: “If I was here from the beginning of the season, we would have won the Scudetto!”
Ibrahimovic has been hailed as a role model for his Milan team-mates and added: “I am president, coach and player, but they only pay me as a footballer.”
The former Sweden international is out of contract at the end of the season, however, and he acknowledges he may not appear in front of a full San Siro again.
On Tuesday Zlatan scored from the penalty spot against Juventus , the game ended 4-2 with Milan leading by 4 goals.
That strike halved a two-goal deficit after efforts from Adrien Rabiot and Cristiano Ronaldo and improbably propelled Milan to a come-from-behind success, with Franck Kessie, Rafael Leao and Ante Rebic also on target.
A three-goal flurry within five minutes helped shrink that deficit, with Rebic scoring the game’s final goal to seal an 18-minute span of dominance for Milan.
With the victory, Milan are up to fifth and have beaten title rivals Lazio and Juve in consecutive matches.
In their Next match Milan will be visiting Napoli on Sunday.