Milan responded to Inter's win against Spezia and with the expected 2-0 triumph over Genoa at San Siro, after two goalless draws, reclaimed the top of Serie A.
For now, however, he is still the "virtual" leader with two more points, because he has one match more than his city rival.
The Rossoneri played a routine game, they didn't shine, but they didn't have too many problems with the penultimate team in the table.
Portuguese Rafael Leao scored in the 11th minute effectively scored on Kalulula's cross, and the Brazilian Junior Mesijas at the end of the match scored the fifth goal of the season.
Milan have not conceded a goal in five league matches, but scored only five in that series.
Milan's rivals are now preparing for the derby in the semi-finals of the Coppa Italia, which will be played in four days.
Inter is hosting the second leg, the first match ended goalless.
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