The answer is that what one man can do will be limited by logistics, but it is believed that football players have played for more than one country previously.
If you mean which countries play American football (or Canadian football - but not soccer), it is played in one form or another in organized leagues, both professional, semi-professional and amateur, in at least 50 countries throughout the world - from the USA and Canada to Japan, Mexico Ireland, Italy, Great Britain, Germany and another 25 countries in Europe.
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