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Real Madrid full-back Marcelo was subjected to racist abuse by Atlético Madrid fans after his side's 3-0 Copa del Rey semi-final first leg victory at the Santiago Bernabéu.
Marcelo was an unused substitute but joined teammates for a post-match warm down when Atléti fans - the only supporters remaining in the stadium - aired monkey chants at him.
They also sang: "Marcelo is a monkey," and when the Brazilian full-back's son came out to hug him they horrifically added "May your father die."
Journalists filing copy after the full-time whistle witnessed the atrocious behaviour, and the Spanish Football Federation will come under pressure to treat the incident seriously.