Neymar left Brazil training on Tuesday after just 15 minutes with a right ankle injury that the team doctor said is related to a foul he suffered against Switzerland and not his recently broken right foot.
Neymar was playing keep-away with a few other players when he suddenly left the training session in Sochi. He limped as he walked away from the field toward the dressing room.
Doctor Rodrigo Lasmar said Neymar left as a precaution after feeling soreness while jogging. The superstar was set to undergo physiotherapy later in the day with an eye toward being fit for Wednesday afternoon's training. Brazil face Costa Rica on Friday in their second Group E game as they look to claim their first win of the tournament.
"What we can do is to calm down," Lasmar said. "A shorter workout was planned for the starters today, they're still in a regenerative process. Neymar trained a little, felt the pain, returned to physical therapy and tomorrow trains normally."