Money is becoming an increasingly crucial entity in football.
It's always been valued highly within sport, but lately it has become something of a necessity for those looking to do well.
And traditionally with great money comes little responsibility.
With a number of clubs being owned by billionaires or consortiums of ridiculously wealthy men, it's becoming an increasing trend that players who never once looked like leaving a club, can do so at a whim with the sniff of a mind-boggling contract.
Lionel Messi is the latest superstar to be linked with a previously-thought-impossible move away from his boyhood side, with three European giants said to be willing to pay a whopping €250million for his services in the summer.
To say that the pint-sized Argentinian leaving Barcelona would be a shock is an understatement.
And so it's with Messi in mind that we put together a list of ten of the most ground-breaking transfers to have ever been completed...