New signing Mario Mandzukic failed to make an impact on his AC Milan debut from the bench
AC Milan's lead at the top of Serie A was cut to two points after they were outplayed by Atalanta at the San Siro.
Cristian Romero headed home Robin Gosens' corner after 26 minutes before Josip Ilicic was brought down by Milan's Franck Kessie in the area midway through the second half.
Ilicic converted the penalty before Duvan Zapata added a third late on.
Inter Milan, who could have gone level at the top with a win, were held to a goalless draw at Udinese.
Atalanta, who become just the second side to beat AC Milan in Serie A this season, rise to fourth in the table.
- Line-upsMatch StatsLive Text
Line-upsAC Milan
Formation 4-2-3-1
99Donnarumma2Calabria24Kjaer20Kalulu Kyatengwa19Hernández8Tonali79Kessié7Castillejo Azuaga18Meité17da Conceição Leão11Ibrahimovic
- 99Donnarumma2Calabria24Kjaer20Kalulu KyatengwaSubstituted forMusacchioat 57'minutes19HernándezBooked at 38mins8Tonali79KessiéBooked at 51mins7Castillejo AzuagaSubstituted forMandzukicat 70'minutes18MeitéSubstituted forDÃazat 45'minutes17da Conceição LeãoSubstituted forRebicat 70'minutes11Ibrahimovic
Substitutes
- 1Tatarusanu5Dalot9Mandzukic12Rebic15Hauge21DÃaz22Musacchio23Tomori27Maldini29Colombo33Krunic90Donnarumma
Atalanta
Formation 3-4-1-2
95Gollini2Toloi17Romero19Djimsiti33Hateboer15de Roon11Freuler8Gosens32Pessina72Ilicic91Zapata
- 95Gollini2Toloi17Romero19DjimsitiSubstituted forCaldaraat 90+1'minutes33HateboerSubstituted forMaehleat 67'minutes15de Roon11Freuler8GosensBooked at 84minsSubstituted forPalominoat 90+1'minutes32PessinaSubstituted forMalinovskiyat 90'minutes72IlicicSubstituted forMurielat 82'minutes91Zapata
Substitutes
- 3Maehle4Sutalo6Palomino7Lammers9Muriel13Caldara18Malinovskiy27Depaoli31Rossi40Ruggeri57Sportiello59Al Miranchuk
Referee:Maurizio MarianiMatch StatsHome TeamAC MilanAway TeamAtalantaPossessionHome51%Away49%ShotsHome14Away18Shots on TargetHome2Away7CornersHome5Away7FoulsHome11Away14Live TextPost update
Match ends, Milan 0, Atalanta 3.
90'+7'Full Time
Second Half ends, Milan 0, Atalanta 3.
90'+5'Post update
Attempt saved. Mario Mandzukic (Milan) left footed shot from the centre of the box is saved in the top centre of the goal. Assisted by Zlatan Ibrahimovic.
90'+5'Post update
Attempt missed. Zlatan Ibrahimovic (Milan) header from the centre of the box misses to the right. Assisted by Theo Hernández with a cross.
90'+2'Post update
Corner, Milan. Conceded by Mattia Caldara.
90'+2'Post update
Attempt blocked. Brahim DÃaz (Milan) right footed shot from outside the box is blocked.
90'+2'Post update
Attempt blocked. Franck Kessié (Milan) header from the centre of the box is blocked.
90'+2'Post update
Corner, Milan. Conceded by Marten de Roon.
90'+1'Post update
Attempt missed. Marten de Roon (Atalanta) right footed shot from outside the box is too high.
90'+1'Substitution
Substitution, Atalanta. Mattia Caldara replaces Berat Djimsiti.
90'+1'Substitution
Substitution, Atalanta. José Luis Palomino replaces Robin Gosens.
90'Substitution
Substitution, Atalanta. Ruslan Malinovskiy replaces Matteo Pessina.
89'Post update
Foul by Mateo Musacchio (Milan).
89'Post update
Luis Muriel (Atalanta) wins a free kick in the defensive half.
89'Post update
Attempt blocked. Zlatan Ibrahimovic (Milan) right footed shot from the centre of the box is blocked. Assisted by Theo Hernández with a cross.
89'Post update
Hand ball by Duván Zapata (Atalanta).
84'Booking
Robin Gosens (Atalanta) is shown the yellow card for a bad foul.
84'Post update
Davide Calabria (Milan) wins a free kick on the right wing.
84'Post update
Foul by Robin Gosens (Atalanta).
82'Substitution
Substitution, Atalanta. Luis Muriel replaces Josip Ilicic.
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Source: bbc.com