The incident occurred at Lisbon’s Estadio da Luz following Vinicius’s spectacular winning goal, forcing referee Francois Letexier to halt proceedings for 10 minutes after initiating Uefa’s racism protocol.

Real Madrid teammate Kylian Mbappe insisted he heard Prestianni use a racist slur “five times” during the confrontation.

The 20-year-old Argentine has reportedly provided evidence to the governing body’s probe, claiming he called the Brazilian forward a homophobic term instead of “mono” – the Spanish word for monkey.

Madrid manager Alvaro Arbeloa urged Uefa to take decisive action against Prestianni, describing the incident as unambiguously racist.

Speaking at his pre-match press conference ahead of Saturday’s La Liga fixture against Osasuna, Arbeloa said: “Vinicius is sad, like all of us, and very indignant about what happened because, evidently, it was a racist act, which we don’t want to happen again.

“It’s in Uefa’s hands. They were the first to fight this battle many years ago, it’s a great opportunity for them to show that this fight is not just words, to take action and punish.”