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Mathieu Flamini: The former Arsenal midfielder is co-owner of GF Biochemicals, which manufactures a substitute for oil. Francis Lee: After playing for Manchester City, Derby and England, Lee set up a paper recycling firm worth millions when he sold it. Ramon Vega: The Spurs defender became an investment banker and now runs a hedge fund. Robbie Fowler: The Liverpool legend built a property empire while still a player. Philippe Albert: Former Newcastle defender runs a fruit and veg company in his native Belgium.