CNN —Brazil superstar Neymar sprained his right ankle in his side’s opening World Cup match – a 2-0 win over Serbia – on Thursday, Brazilian team doctor Rodrigo Lasmar confirmed last night in a post-game press conference. Lasmar said that the team had already begun treating Neymar and would have more clarity in 24 to 48 hours. Neymar is playing in his third World Cup. Brazil began this World Cup as the favorite to win its first World Cup since 2002, with a 20% chance of winning the tournament according to Nielsen’s Gracenote, after losing just three times in 50 matches since it was eliminated from the 2018 World Cup by Belgium. Neymar will face a race to be back to full fitness by the time Brazil plays Switzerland in its next Group G match on November 28.

---