Thomas Tuchel and Andre Villas-Boas have both admitted to not hearing any of the alleged racist language used towards Neymar in Le Classique on Sunday, but remained adamant that it has no place in football or anywhere.
Neymar was one of the players who saw red after an altercation with Alvaro Gonzalez, and on his way off the pitch he indicated to the fourth official that he had been racially abused, before detailing what happened in a social media post.
Alvaro has denied the accusations via a Twitter post.
Tuchel was asked about the incident afterwards, but he didn't hear anything from the dugout.
"What I heard? He [Neymar] told me that it was some racist insult, but I did not hear anything on the pitch," the German said.
"I think that everyone has the same opinion that racism in all the society, in sports or in our lives can't exist. It's obvious, but I did not hear that today, neither [did] the referee so I can't answer this question."
Villas-Boas echoed these comments, and also mentioned a previous incident involving Angel Di Maria which seemed to show the Argentine spitting at Alvaro.
"I don't know. I hope not, there is no place for racism in football," the former Spurs and Chelsea boss told Telefoot when asked he if had heard any racist language.
"It's a serious fault if it happened but I don't think so. Before that, we had a situation with a spit from Di Maria.
"These are things to avoid in the world of football. I hope it won't be a black spot in this historic performance."