Contract clauses are increasingly common in the world of modern football. Some are necessary, like in Spain for example, where it is customary to have a release clause inserted in your contract.
Some are included as a sweetener to ensure a club lands a player ahead of their rivals. And some are, well, just completely bizarre.
Here we look at 10 clauses - some that were written into the contracts of some very high profile footballers - to provide an insight on what goes on behind the scenes at football clubs when players put pen to paper on big-money deals.
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