Mario Yepes' 82nd minute header completed the fightback for the defending champions who trailed to goals from Uruguayans Guillermo Giacomazzi and Carlos Grossmuller and a Massimo Oddo penalty after a shambolic first-half display.

Milan started the weekend in 13th place but moved to 11 points, two behind overnight leaders Juventus, while struggling Lecce were left on four points after a fourth straight home defeat this season.

Giacomazzi headed Lecce in front after four minutes and former Milan defender Oddo converted a harshly awarded penalty on the half hour following a foul by Yepes on Daniele Corvia.

On a bumpy pitch, a mistake by Mark van Bommel set up another Lecce counter-attack seven minutes later which Grossmuller finished off by slotting the ball past Christian Abbiati.

The game changed completely when the ineffective Robinho was replaced by the heavily tattooed Boateng at halftime.

The Ghana international fired in from close range within four minutes and scored with an exquisite first time strike from 25 meters following Antonio Cassano's pass six minutes later.

He levelled with an opportunist goal in the 63rd minute when a rebound from Ignazio Abate's shot landed at his feet, although Yepes was clearly offside at time.

Antonio Nocerino hit the bar and Zlatan Ibrahimovic just failed to turn in a Cassano pass for Milan before Cassano's delicate cross was headed in by Yepes with eight minutes left.