Football has always been an alluring realm for millionaires, billionaires, mega-rich businesses and affluent individual investors.
The sport grants access to a unique global market and brings with it a certain level of prestige, particularly so when it comes to successful clubs.
Since the turn of the millennium there has been an influx of so-called 'oil money' into the game, with a number of clubs across the world benefitting.
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But what exactly is 'oil money' and which clubs are on the receiving end of investment? Goal takes a look at the phenomenon.