Napoli, who were without injured striker Victor Osimhen, had Andre-Frank Zambo Anguissa sent off in the second half.
Real Madrid and AC Milan take leads in Champions League quarter-finals
AC Milan 1-0 Napoli: Bennacer goal secures narrow Rossoneri lead over Serie A high-flyers
AC Milan beats 10-man Napoli 1-0 in Champions League QF
Ruben Loftus-Cheek 'agrees to AC Milan move with his Chelsea contract up at the end of next season
Ismael Bennacer gives AC Milan advantage over Napoli
AC Milan beats 10-man Napoli 1-0 in Champions League QF
AC Milan 1-0 Napoli: Player ratings as Rossoneri snatch narrow Champions League win
Ismaël Bennacer earns hard-fought win for Milan over 10-man Napoli, Champions League
A dominant left side, the exit of Piątek and the importance of Bennacer: a few thoughts from the last two weeks
AC Milan 1 - 0 Napoli - Match Report & Highlights
International Football Archives - Page 11 of 29 - The Cult of Calcio