Brazil needed an extra-time winner from Malcom to claim Olympic gold with a 2-1 win over Spain on Saturday.
The game headed into extra-time when Mikel Oyarzabal ruled out Matheus Cunha's opener but former Barcelona man Malcom scored after 109 minutes to seal the win for Brazil.
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Brazil are the first nation to retain their Olympic crown since rivals Argentina won consecutive gold medals in 2004 and 2008.
Brazil claimed their first ever Olympic gold in men's football in Rio 2016 when Neymar scored the winning penalty in the shootout against Germany.