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
99Donnarumma2Calabria24Kjaer20Kalulu Kyatengwa19Hernández8Tonali79Kessié7Castillejo Azuaga18Meité17da Conceição Leão11Ibrahimovic
- 99Donnarumma2Calabria24Kjaer20Kalulu KyatengwaSubstituted forMusacchioat 57'minutes19HernándezBooked at 38mins8Tonali79KessiéBooked at 51mins7Castillejo AzuagaSubstituted forMandzukicat 70'minutes18MeitéSubstituted forDíazat 45'minutes17da Conceição LeãoSubstituted forRebicat 70'minutes11Ibrahimovic
- 95Gollini2Toloi17Romero19DjimsitiSubstituted forCaldaraat 90+1'minutes33HateboerSubstituted forMaehleat 67'minutes15de Roon11Freuler8GosensBooked at 84minsSubstituted forPalominoat 90+1'minutes32PessinaSubstituted forMalinovskiyat 90'minutes72IlicicSubstituted forMurielat 82'minutes91Zapata
- 3Maehle4Sutalo6Palomino7Lammers9Muriel13Caldara18Malinovskiy27Depaoli31Rossi40Ruggeri57Sportiello59Al Miranchuk
Referee:Maurizio MarianiMatch StatsHome TeamAC MilanAway TeamAtalantaPossessionHome51%Away49%ShotsHome14Away18Shots on TargetHome2Away7CornersHome5Away7FoulsHome11Away14Live TextPost update
Match ends, Milan 0, Atalanta 3.
Second Half ends, Milan 0, Atalanta 3.
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.
Attempt missed. Zlatan Ibrahimovic (Milan) header from the centre of the box misses to the right. Assisted by Theo Hernández with a cross.
Corner, Milan. Conceded by Mattia Caldara.
Attempt blocked. Brahim Díaz (Milan) right footed shot from outside the box is blocked.
Attempt blocked. Franck Kessié (Milan) header from the centre of the box is blocked.
Corner, Milan. Conceded by Marten de Roon.
Attempt missed. Marten de Roon (Atalanta) right footed shot from outside the box is too high.
Substitution, Atalanta. Mattia Caldara replaces Berat Djimsiti.
Substitution, Atalanta. José Luis Palomino replaces Robin Gosens.
Substitution, Atalanta. Ruslan Malinovskiy replaces Matteo Pessina.
Foul by Mateo Musacchio (Milan).
Luis Muriel (Atalanta) wins a free kick in the defensive half.
Attempt blocked. Zlatan Ibrahimovic (Milan) right footed shot from the centre of the box is blocked. Assisted by Theo Hernández with a cross.
Hand ball by Duván Zapata (Atalanta).
Robin Gosens (Atalanta) is shown the yellow card for a bad foul.
Davide Calabria (Milan) wins a free kick on the right wing.
Foul by Robin Gosens (Atalanta).
Substitution, Atalanta. Luis Muriel replaces Josip Ilicic.
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