Neymar appeared to be in tears on the bench at the end of Brazil’s opening World Cup win over Serbia after being substituted with a sprained ankle.
Brazil’s team doctor confirmed the forward suffered the injury and that it will be reassessed on Friday.
The 30-year-old was replaced in the 80th minute of Thursday’s 2-0 win after a heavy tackle from Nikola Milenkovic.
He sat with his face covered while receiving treatment and pictures showed his right ankle was heavily swollen.
The Selecao face Switzerland in their second Group G game on Monday .
The Paris St-Germain striker has suffered a number of injury problems with his right foot over the past few years.
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