The Real Madrid star alleged that Benfica’s Gianluca Prestianni subjected him to racial abuse during their Champions League clash at the Estadio da Luz.
UEFA has launched an investigation, and Prestianni has been provisionally suspended for the second leg at the Santiago Bernabeu.
Speaking after the game, Luis said his earlier comments had been “misinterpreted” and wanted to set the record straight regarding his stance on the incident.
"I would like to clarify my words, which were widely misinterpreted in the last press conference I held,” he told the media.
“At no time was my intention to minimise the (alleged) racist act, nor to disrespect the victim in this case, quite the contrary. Let me say it again: Flamengo and I stand with Vini.
"I repudiate racism, I condemn the act of racism, racism is a crime. As I've said before, if the player (Prestianni) did this, it's not up to me to judge him, but if he did, let him pay, let him pay severely.
"It's easy for me to come here and speak, it's easy to make 'no to racism' t-shirts, it's easy to wear an anti-racist bracelet. What's difficult is punishing. If he (Prestianni) did it, let him pay. Flamengo supports all of Vini's causes, always. I have immense affection and admiration for him, and I'm with him."