One of the great World Cup success stories has been the "magic spray" used by referees to keep a defensive wall 10 yards (9.15 meters) from the ball at free kicks but its inventor says he is more concerned with the good of the game than making millions.

Heine Allemagne, 43, who has given FIFA free use of his invention at the finals, says he is driven by a love of the game and helping referees keep discipline rather than becoming a multi-millionaire.

And his invention could hardly be more simple. The referee sprays a line of biodegradable foam derived from vegetable oil in a line on the pitch indicating where the players must stand at a free kick, and that line disappears within a minute or two.