The almost 40-year-old Zlatan Ibrahimovic played his last match on May 5, against Juventus.
The striker then suffered a tough knee injury which has since kept him away from games.
Today, he was found in the player squad and was replaced in the 60th minute.
And it took seven minutes - then he had found his way into the goal record.
Milan were already in the lead at the time, after Rafael Leao gave the team the lead in the first half, when Ibrahimovic was served by Ante Rebic to 2-0.
It is his first Serie A goal since March 21.
The match is in progress.