You've probably seen coverage of the Alexander Isak transfer saga, but you are probably far less familiar with a little-known FIFA rule called Article 17. It could be the key to unlocking Isak's future.

A little-known transfer rule could play into the hands of Alexander Isak and provide him with some much-needed leverage as he attempts to force through a move to Liverpool. The transfer saga of the summer took another bitter turn on Tuesday night,

That's how long it has been since Liverpool's £110m bid for Newcastle striker Alexander Isak was rejected. Since then, there have been no further offers. But it hasn't stopped the future of the 25-year-old Sweden striker being the biggest talking point of the summer window.