You have to play on a club team and your highschool varsity team.
He plays for Flamengo
Yes, because a player can play for an International team and a club team. USA is an international team, and FC Barcelona is a club team, so Yes, it is possible,
he coaches the Mexican football team but his last club before he retired was 'Club Celaya' in 1997
Chelsea Football club.
Nationally: Spain Club: Barcelona
England and Team Bath
his current club Toulon.
No, there is not any footballer that does not play on a team or a club, because than they wont be called a footballer.
National team: Czech Republic Club: Juventus
Yohan Cruyff played for national team Netherlands and club team Barcelona.
Franz Beckenbauer played for the German club Bayern Munich.