Koulibaly, who is now one of the most sought-after defenders in Europe, was targeted by Inter Milan fans with the chants during a Serie A game at San Siro on Wednesday, suffering abuse from the home support throughout the match.
With their side winning 1-0 - through an extra time victor -, taking the three points, and additionally the "icing on their cake" of seeing the target of their vitriol being sent off it seems however the scum support have had the last laugh.
"You're one of the most lovely people I know, please never change".
Koulibaly was sent off 10 minutes from the end of Napoli's 1-0 defeat at the San Siro, with substitute Lautaro Martinez scoring a stoppage-time victor for Inter.
Four Napoli fans were hurt and one of them was stabbed, police said.
Ancelotti said that they had asked three times for the game to be stopped due to the abuse, but that the only action taken was to make announcements to the crowd.
"You can't die for a football game", said far-right Interior Minister Matteo Salvini, adding that he would summon fan organisations for talks in January.
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As well as the alleged racist chanting, there was also violence outside the stadium prior to the kick-off with one supporter said to have been killed after being hit by a van.
Koulibaly's compatriot and Senegal teammate Sadio Mane has now sent a message to the centre-back.
Second-placed Napoli dropped nine points behind leaders Juventus, who earlier drew 2-2 at Atalanta, while the gap between them and third-placed Inter was cut to five.
"We're looking into appealing", Mattia Grassani to Radio Kiss Kiss. Despite our requests and the chanting, the game wasn't suspended.
"Racism is ignorance by definition", he told ANSA.
According to the Italian press, the incident occurred at the end of a fight between Napoli fans who had arrived at the stadium by minibus and Inter supporters armed with chains and hammers.
The football world has been united in its condemnation of monkey chants from Inter Milan fans towards Napoli defender Kalidou Koulibaly, with prominent figures including Mo Salah insisting racism has "no place" in the game.