The Spanish champions announced that they are conducting an investigation to find and identify those responsible for the insulting and disgraceful remarks.
Spanish football is struggling to combat racism in stadiums across the country.
Real Madrid striker Vinicius Junior has become a figurehead in the fight against racism and has been targeted on numerous occasions since arriving in Spain in 2018.
The Brazilian winger earned worldwide support in May 2023 when he squared off with Valencia supporters after suffering abuse at their Mestalla stadium.
In January 2023, an effigy in a Vinicius shirt was found hanging from a bridge near the club's training ground alongside a banner saying: "Madrid hates Real".
In December, four Atletico Madrid fans were charged over the incident, with prosecutors pushing for jail terms of four years.
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This week Spanish police arrested four men suspected of inciting an online hate campaign against Vinicius.
(Except for the headline, this story has not been edited by staff and is published from a syndicated feed.)