Dipping into the transfer market can be an expensive business in modern football, with clubs sometimes splashing millions on superstars only to be sold on for a fraction of the price.
On the other hand, teams can also snap up the next big thing for peanuts, nurture them into a world-beater and earn a handsome return on their prodigious youngsters.
Using transfer figures sourced from transfermarkt.com, here are five players who have given their former club the biggest transfer sale-returns in the history of the game.
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