Napoli, who were without injured striker Victor Osimhen, had Andre-Frank Zambo Anguissa sent off in the second half.
Ismaël Bennacer earns hard-fought win for Milan over 10-man Napoli, Champions League
Milan's Pioli regrets only scoring once past Napoli - Taipei Times
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Milan vs Napoli: Angry Spalletti berates 'unfair' red card after Champions League defeat - Pulse Sports Nigeria
Milan 1-0 Napoli: Bennacer gives Rossoneri the edge in all-Italian quarter- final, UEFA Champions League
Watch: Milan's Pioli regrets only scoring once against 10-man Napoli - SportsDesk
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Milan vs Napoli: Angry Spalletti berates 'unfair' red card after Champions League defeat - Pulse Sports Nigeria
Latest news about Ismael Bennacer (AC Milan)
Ismaël Bennacer earns hard-fought win for Milan over 10-man Napoli, Champions League
Bayern Munich Teammates Sadio Mane and Leroy Sane Clash After Manchester City Humbling, Say Reports - News18
AC Milan beats 10-man Napoli 1-0 in Champions League QF