Defender Gabbia rose highest to thump home Tijjani Reijnders' free-kick in the 89th minute and give Milan a Serie A win which pulls them out of a miserable early season slump.
Juventus were held to a 0-0 Serie A draw at Empoli on Saturday as Thiago Motta's side dropped more points after their goalless home stalemate against AS Roma before the international break.
Inter and AC Milan on Friday rejected the project to modernise and restructure the iconic San Siro stadium which they share, city mayor Giuseppe Sala announced.
Victor Osimhen has been sidelined by Napoli after the team he fired to Serie A glory just a over year ago left him both off their squad list for the 2024/25 campaign and potentially in season-long limbo.
Belgium striker Lukaku completed a permanent move to Napoli from Chelsea on Thursday, ending a long period of limbo with the Blues.
Inter Milan thrashed Atalanta 4-0 on Friday to move provisionally top of Serie A, while Torino snatched a late 1-0 win at Venezia to continue their positive start to the campaign.
The futures of Napoli striker Victor Osimhen and England international Ivan Toney are set to dominate the final day of the European transfer window on Friday as Chelsea continue their frenzied pursuit of new signings.
Napoli have signed Romelu Lukaku from Chelsea, the Serie A club announced on Thursday, ending the Belgium striker's extended period in limbo with the Blues.
Poland goalkeeper Wojciech Szczesny on Tuesday announced he was retiring from football at the age of 34 less than two weeks after the end of his contract with Juventus.
Late goals by Ivan Perisic and Eder completed a superb comeback for Inter Milan as they recovered from a goal down to beat Chievo Verona 3-1 at the San Siro in Serie A on Saturday.
Napoli scored in the fifth minute of stoppage time to snatch a 2-1 win over Sampdoria who had a player controversially sent off as Serie A resumed with a bang on Saturday.
Napoli substitute Manolo Gabbiadini converted a penalty with the last kick of the game to salvage a 3-3 draw at Fiorentina who were inspired by a superb display from Federico Bernardeschi.
Ivorian youngster Franck Kessie hit a second-half leveller and set up a dramatic last-gasp winner as Atalanta ended a three-game winless run in a 2-1 win over Empoli on Tuesday.
Gonzalo Higuain struck again with a trademark goal to give Serie A leaders Juventus a 1-0 win over AS Roma in a tense top-of-the-table match which put them seven points clear on Saturday.
Dries Mertens scored a hattrick to lead revitalised Napoli to a 5-0 rout at leaky Cagliari in Serie A on Sunday.
Lazio beat Sampdoria 2-1 on Saturday with Felipe Anderson setting up both their goals as they rebounded from last week's derby defeat to AS Roma to climb up to fourth in Serie A.
Gonzalo Higuain completes a sensational move to Juventus after the Italian champions agree to pay a 90 million euros ($98.8m) fee, the third highest in history, to wrest the Argentine striker from Napoli .
Juventus have paved the way for Miralem Pjanic to join the Serie A champions after paying an estimated 38 million euros to trigger his release clause from Roma, reports said Sunday.
Gonzalo Higuain hit a hat-trick to set a new all-time record of 36 goals in a single Serie A season as Napoli secured second spot and Champions League football with a dramatic 4-0 rout of 10-man Frosinone.