Napoli manager Carlo Ancelotti has said that defender Kalidou Koulibaly was subjected to monkey chants all throughout Wednesday's 1-0 defeat at Inter.
Koulibaly was sent off with 10 minutes to play in a scoreless match at San Siro, as he was given a yellow card for a foul and then a second yellow for sarcastically applauding the referee.
That red card would prove decisive, as Lautaro Martinez scored a stoppage-time winner for Inter before Dries Mertens was also sent off for Napoli in stoppage time.
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It was a damaging loss for Napoli, who fell nine points behind Serie A leaders Juventus.