Despite Nelson Dida's goalkeeping howler, Milan turned their game around to beat Chievo 3-1 with Massimo Oddo's first goal for the club.
The Rossoneri were still dealing with an injury crisis and had to do without Paolo Maldini, Marcos Cafu, Alessandro Nesta, Serginho, Kakha Kaladze, Alessandro Costacurta and Pippo Inzaghi, while there was also pressure to rest players ahead of the Champions League match with Celtic. Chievo were in trouble too, as Luciano, Victor Obinna, Vincenzo Sicignano and Federico Cossato were injured with Fabio Moro and Erjon Bogdani suspended. As before every game this weekend, there was a minute's silence for the death of respected journalist Giorgio Tosatti.
Dida almost gave away a goal after four minutes with a terrible clearance straight to Paolo Sammarco, but the pass found Sergio Pellissier offside. Kaka and Ronaldo combined to thread through for Alberto Gilardino, whose first touch let him down in front of the goalkeeper.
Moments later Il Fenomeno hit the back of the net, but the whistle had already gone for an incorrect offside decision.
Dida flapped at a long free kick to take it away from Pellissier and from the resulting corner Davide Mandelli nodded wide.
The uncertainty was even more evident when Chievo took the lead in comical circumstances. Daniele Bonera was trying to protect the ball from Pellissier, but ended up clattering into Dida instead and allowed their opponent to waltz into an empty net!
Moments later Milan nearly equalised with Gilardino's glancing header well saved by Squizzi, then the goalkeeper flew to fingertip a splendid Andrea Pirlo free kick out from under the bar.
Massimo Oddo also had a set-piece smothered, but Vincenzo Italiano saw Dida off his line and attempted a strike from 30 metres.
The Rossoneri drew level and it was again thanks to a defensive error. Squizzi beat away a sudden Kaka snapshot and Gilardino pounced on the loose ball, chipping it over the scrambling goalkeeper.
Mandelli did well to nod Oddo's sweeping cross off the head of Ronaldo from six yards. Chievo Coach Gigi Del Neri was sent off for insulting the linesman and fourth official after 35 minutes at San Siro.
Ronaldo took on three men with a series of step-overs before his shot was deflected for a corner, but Gennaro Gattuso was booked for a tactical foul on Giuseppe Cozzolino as he launched a counter-attack.
Ronaldo spun round to leave a defender for dead, but the finish from the edge of the area was too weak to truly trouble Squizzi.
After the restart Kaka believed he was brought down on the counter, but the referee waved play on. Pirlo's free kick was controlled and Gattuso had an effort closed down.
Milan were passing the ball around with more pace in this half and Ronaldo combined with Gilardino to reach Oddo on the very edge of the area. The ex-Lazio man let go of a right-foot foot screamer into the far corner to turn the game around.
However, Dida was having a nightmare and he completely missed a cross moments later, clattering into Dario Simic and Pellissier, but fortunately for him the ball swung just wide of the open goal.
Brocchi's pass went through a Kaka dummy to Ronaldo and he slashed the shot wide, while at the other end Dida had to deal with a tricky backpass under pressure from Paolo Sammarco.
A Kamil Kosowski cross went past everyone - defenders and forwards - with only a touch needed to score and Simic attempted an audacious strike from over 30 metres.
It was an all-Brazilian move on 70 minutes with Kaka's change of pace and Ronaldo spinning round, but the ex-Inter man was closed down when he should perhaps have passed back to his teammate.
Ronaldo was even more egotistical soon after, as on the counter he took advantage of Salvatore Lanna's slip and tried to chip the 'keeper, but Kaka was totally unmarked in the centre.
The former Real Madrid star had another effort charged down by Malago' and tried to break through three players, while Kosowski drilled wide for Chievo. Kaka's cutback for an unmarked Ronaldo at the back post was charged down for a corner and on the resulting set-piece Il Fenomeno tried to dribble through only to suffer from cramp.
Clarence Seedorf secured the victory in stoppages with a classic free kick. The Dutchman curled a fine finish into the near top corner, leaving Squizzi immobile. (Channel 4)
Bye.