Real Madrid’s Brazilian forward Vinicius Jr alleges he was racially abused by Benfica’s Gianluca Prestianni.

Real Madrid has sent UEFA, football’s governing body in Europe, “all available evidence” of an alleged racist insult against Vinicius Jr in a Champions League match against Benfica.

“Our club has actively collaborated with the investigation opened by UEFA following the unacceptable episodes of racism experienced during that match,” the Spanish club said on Thursday without elaborating on the evidence.

UEFA appointed a special investigator on Wednesday to gather evidence about what happened in Lisbon on Tuesday in Madrid’s 1-0 win at Benfica in the first leg of the knockout round of the Champions League.

Vinicius accused Benfica player Gianluca Prestianni of calling him “monkey” after the Brazilian scored the only goal. Prestianni was among the Benfica players upset with Vinícius after the forward celebrated by the Benfica corner flag.

Prestianni covered his mouth with his shirt when he allegedly spoke to the Brazilian player and denied racially abusing Vinicius, who is Black and has been subjected to repeated racist insults in Spain.

“Real Madrid appreciates the unanimous support, backing, and affection that our player Vinicius Jr. has received from all areas of the global football community,” the club said. “Real Madrid will continue working, in collaboration with all institutions, to eradicate racism, violence, and hate in sports and society.”

Benfica said Prestianni was the victim of a “defamation campaign” and welcomed the investigation opened by UEFA, saying it “fully supports and believes the version presented” by Prestianni.

FIFA President Gianni Infantino said on Wednesday he was “shocked and saddened to see the incident of alleged racism” and praised the referee for activating the antiracism protocol during the match, which was halted for nearly 10 minutes at the Stadium of Light.