Lionel Messi will see medical experts after vomiting during matches.
The Barcelona playmaker was reported to have been sick on the pitch during the midweek draw between Argentina and Romania.
“Something is not right, but it doesn’t affect his performance,” said Barca boss Gerardo Martino ahead of Saturday’s trip to Valladolid. “It happens to him regularly.
“But it isn’t a cause for concern. It doesn’t affect him at all in terms of doing his job.”
Messi also appeared to vomit on the pitch during half-time of Argentina’s friendly against Bolivia in March 2013.
Previous reports had indicated that the four-time Ballon d’Or winner was sick during Barca matches.
“He has even gone to see specialists at certain times but their tests have proved inconclusive,” Martino added.