Play was halted for 10 minutes when Vinicius claimed he had been racially insulted by an opponent during Madrid's 1-0 win on Tuesday night.
"He's been subjected to this a few times throughout his career and he's handled it excellently. But for it to carry on and for it to happen tonight, it's a disgrace to football," Madrid defender Trent Alexander-Arnold told Amazon.
Vinicius had just whipped a wonderful goal into the top corner to give Madrid the lead in the first leg of their playoff with Benfica at the Stadium of Light.
He and his teammates celebrated wildly with the forward dancing in the corner.
What followed were ugly scenes that led to Vinicius informing referee Francois Letexier that a racist comment had been made and appeared to point towards Benfica's Gianluca Prestianni. The official crossed his arms to signal soccer's anti racism protocol.
Prestianni had earlier approached Vinicius while covering his mouth with his jersey.
Vinicius sat alone in the dugout before play resumed without any players being sent off as a result of his claims.
After the game, Vinicius posted in Portuguese on his Instagram story: "Racists are, above all, cowards. They need to put their shirts in their mouths to demonstrate how weak they are.
"But, they have protection from others who, theoretically, have the obligation to punish. Nothing that happened today is new in my life and my family's."
In a statement in Portuguese on Instagram, shared by Benfica on social media, Prestianni denied making racist comments.
He wrote: "I want to clarify that at no time did I direct racist insults to Vini Jr, who regrettably misunderstood what he thought he heard.
"I was never racist with anyone and I regret the threats I received from Real Madrid players."
Benfica coach Jose Mourinho, who also spoke to Vinicius, said his player denied the accusation of racism.
"They told me different things," he said, adding that he wanted to be independent.
But in reference to previous occasions when Vinicius has been subjected to racist taunts, Mourinho said: "But there is something wrong because it happens in every stadium. ... The stadium where Vinicius played something happened. Always."
Elsewhere, Paris Saint-Germain's title defence looked to be unraveling when 2-0 down in Monaco until Desire Doue came off the bench to inspire a 3-2 win.
Galatasaray beat Juventus 5-2 and Borussia Dortmund won 2-0 against Atalanta
PSG are making hard work of their title defence.
Failure to advance directly to the round of 16 after the league phase of the competition left Luis Enrique's team having to negotiate an all-French playoff against Monaco. And despite PSG's dominance of the French league, they found themselves 2-0 down after 18 minutes at Stade Louis-II.
Folarin Balogun headed Monaco in front inside a minute and then doubled the home team's lead.
After Vitinha failed to score from the penalty spot Luis Enrique sent for Doue in the 27th.
Within two minutes he'd pulled a goal back and when another of his efforts were saved shortly before halftime, Achraf Hakimi followed up with an equaliser.
Monaco were down to 10 men early in the second half when Aleksandr Golovin was sent off and Doue struck the winner in the 67th.
Galatasaray pushed Juventus to the brink of elimination in a wild comeback win in Istanbul.
Trailing 2-1 at halftime at RAMS Park, the Turkish giant powered back after the break. Noa Lang scored two of Galatasaray's four second-half goals to stun the two-time European champions.
Galatasaray take a three-goal lead into the second leg in Turin next week with the chance to advance to the round of 16 for the first time since 2014.
Juventus responded well to going a goal down through Gabriel Sara after 15 minutes, with Teun Koopmeiners equalising a minute later and adding another before halftime.
But Galatasaray took control in the second half half. Lang levelled four minutes after the restart, scoring from close range.
Davinson Sanchez gave the home team the lead on the hour and Juventus' challenge was made more difficult when Juan Cabal was sent off 22 minutes after coming on as a halftime substitute.
Lang got his second when capitalising on sloppy Juventus' defence and Sacha Boey drove in from the angle in the 86th.
Dortmund are in control against Atalanta after goals from Serhou Guirassy and Maximilian Beier gave the Germans a 2-0 lead heading into next week's second leg in Italy.
with AP
