Why fifa banned lionel messi

I think there may be some misinformation here!

Lionel Messi has not been banned by FIFA. In fact, he is still an active player and one of the most successful and renowned footballers in the world.

It's possible that you may be thinking of another player or incident. If you could provide more context or clarify what you're referring to, I'd be happy to help clarify or correct any misinformation.