Brazil star Neymar underwent tests and was receiving treatment at the team’s hotel Friday after injuring his right ankle in the 2-0 defeat of Serbia in their World Cup opener. The team did not give any detail on the extent of his injury.

Neymar sprained his ankle in the second half of a bruising match against Serbia on Thursday. He was in tears while sitting on the bench and after the match limped off the field on his way to the locker room.

Brazil coach Tite had already expressed optimism about Neymar’s condition.

Team doctor Rodrigo Lasmar said after the game it was too early to know the extent of the injury. He said they started treating the injury the moment Neymar left the field, and continued after the match.

Neymar was substituted in the 79th minute, about 10 minutes after hurting his ankle while being tackled by Serbia defender Nikola Milenković.

Neymar had already been tackled many times before during the match, and was seen grimacing and limping a few other occasions. He was fouled nine times, the most of all World Cup players after the first round of matches in the group stage.