As the 28-year-old Barcelona winger was playing for Argentina against Chile, reports say his brother Rodrigo was hit by a fan just as the first-half was coming to an end.
Chile supporters were believed to have started a verbal exchange before things got violent – it is reported that Sergio Aguero's family were also insulted in the stands of Santiago's Estadio Nacional.
The home-side Chile went on lift the trophy after beating Argentina 4-1 on penalties as it ended goalless after 90 minutes and extra time.
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