Strange. Some players do this regularly and no one questions them if they're fit to continue. Zinedine Zidane was well known for puking during games, Lionel Messi has done it, Peter Schmiechel albeit in a very stressful situation. I've even had a player puke twice within a minute during a cup final the other week, in the centre circle. And we all know what Gary Lineker has admitted to doing on the pitch. Sometimes, your pre-match meal just doesn't want to stay in.