Leopoldo Luque, the moustache-sporting striker who was a key part of the Argentina side that won their first World Cup at home in 1978, died on Monday, the Argentine Football Association said.
Luque, who was 71, was hospitalised with COVID-19 over the festive period and he never fully recovered, Argentina media reported.
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Luque was an integral member of the 1978 team, scoring four goals and forming part of a swashbuckling attack with Daniel Bertoni and Mario Kempes.
He scored the hosts' first goal in the 2-1 opening win over Hungary and twice in the notorious 6-0 win over Peru that took them into the final.
Luque played all his club football in Latin America, with spells at Rosario Central, River Plate and Racing, among other clubs. He also played for Santos in Brazil and Mexican club Deportivo Tampico.
Luque's death comes three months after that of his former teammate Diego Maradona.