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.
Ten-man Torino are cruelly denied a shock win away to their more illustrious neighbours Juventus when Gonzalo Higuain strikes in stoppage time to salvage a 1-1 draw for the Serie A leaders.
Pescara midfielder Sulley Muntari has been banned for one game after he walked off the pitch at Cagliari on Sunday, having been booked for complaining to the referee about racist abuse in the crowd.
Serie A leaders Juventus withstood prolonged pressure as they held out for a tense 1-1 draw at third-placed Napoli in an absorbing match on Sunday.
Napoli's remote hopes of overhauling Serie A leaders Juventus were dealt a possibly fatal blow when they lost 2-0 at home to Atalanta on Saturday and the Turin side ploughed on by beating Empoli by the same score.
Juventus coach Massimiliano Allegri insisted the Serie A title race is far from over after a sensational first-half strike from Colombian Juan Cuadrado sent the Turin giants six points clear of Napoli on Sunday.
Luis Muriel's penalty gave Sampdoria a shock 1-0 win over AC Milan 1-0 on Sunday to compound the Rossoneri's hopes of a return to European football.
Serie A sinner Mauro Icardi can impress Argentina coach Edgardo Bauza when he watches the Inter Milan striker at leaders Juventus on Sunday, according to coach Stefano Pioli.
Inter Milan continued their stunning revival under coach Stefano Pioli as they beat basement club Pescara 3-0 to record their seventh successive Serie A victory which lifted them above Lazio into fourth place on Saturday.
AC Milan recovered from two goals down to salvage a 2-2 draw at Torino, who also missed a first-half penalty, as the visitors finished with 10 men in a dramatic Serie A game on Monday.
The Serie A title race is far from over, Juventus coach Massimiliano Allegri warned after a first-half opener by Chinese Super League target Nikola Kalinic paved the way for Fiorentina's shock 2-1 defeat of the champions.