There are fears of a fresh injury crisis for Brazilian superstar Neymar.

It was gathered Neymar left Brazil training on Tuesday after just 15 minutes with a right ankle injury.

 The Brazil team doctor said it 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.

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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.

"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."

A day earlier, the forward had skipped training, one day after Sunday's 1-1 draw against Switzerland -- a game in which he was fouled 10 times, the most of any player in the competition in 20 years.

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