Lionel Messi will see medical experts to unravel the mystery surrounding a series of vomiting incidents during football matches, Gerardo Martino has revealed.
The Barcelona star was sick on the pitch during Argentina's midweek friendly against Romania, which is reported to be the latest in a series of similar incidents for club and country.
Barcelona manager Martino described Messi's mystery condition as 'not normal' when asked about it in a press conference but played down the seriousness of it, saying Messi's form has not been affected by it.
Speaking ahead of this weekend's La Liga tie against Real Valladolid, Martino said: 'I've spoken with him and it happens regularly. I'm not a specialist but I understand it's not something normal.
'He's even been to see specialists at certain times and a solution hasn't been found yet, but there's no cause for concern It doesn't affect him doing his work at all. It's something he's had for some time.'
Messi played the full 90 minutes for his country on Wednesday night but failed to make an impact on the game, which finished 0-0.
After the game the 26-year-old played down his on-pitch illness: "My vomiting has always happened," he said. "It happened a few times with Barça. It's nothing to me."
The four-time Ballon d'Or winner is expected to start in the game against Real Valladolid at the weekend as Barcelona attempt to reclaim top spot from Real Madrid.