Vinicius fell and clutched his thigh on Friday early in the 1-0 victory at Celta de Vigo in the Spanish league.
A Madrid statement did not offer a timeline for the Brazil wing's return. He was expected to play for Brazil in the first two matches of South American World Cup qualifying against Bolivia on Sept. 8 and Peru four days later.
Madrid has suffered a rash of injuries, notably to left knee ACLs by defender Éder Militão in the first match of the season and goalkeeper Thibaut Courtois in training.
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The Associated Press