Lionel Messi

Barcelona have been alerted to Lionel Messi medical situation after the Argentine star vomited on the pitch during his country's friendly against Romania.

In the seventh minute of the game Messi was forced to stop in his tracks and began to vomit. Barcelona are concerned about this issue as it is not the first time, as Messi was sick against Bolivia last year and with Barcelona during the 2011 Spanish Supercup.

Asked about the incident after the match, Messi said: "I don't really know what it is.

"It happens to me regularly in games, in training, when I'm at home. I've had thousands of tests. Sometimes it happens to me before the match. I start to retch, I end up almost vomiting and then it passes."

Meanwhile Barcelona manager Gerardo Martino claims that they are not worried at all about Messi's problem, although he admitted that his fellow countryman has sought specialist help.

"Something is not right, but it doesn't affect his performance. It happens to him regularly," said Martino.

"But it isn't a cause for concern. It doesn't affect him at all in terms of doing his job. He has even gone to see specialists at certain times but their tests have proved inconclusive."

On Wednesday the Catalan side will host the second leg of the Champions League last 16 against Manchester City, after beating 2-0 Manuel Pellegrini's side at the Emirates Stadium.