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How do you sell a talented soccer player to a professional soccer club?
Yes you have to play for a soccer club or team to go into big games that are known like at a stadium. But you certainly don't have to be in a club to play a game of soccer with your friends!
They are sold mainly to make a profit, and to buy a younger footballer needed by the club or if he is reached thirty years then he is sold cheap and a useful player and younger one comes in..