Kylian Mbappe has let clubs chasing his signature know of a bizarre clause he wants inserted into his contract, ahead of any potential summer move. 

At various stages PSG, Real Madrid and Liverpool have all emerged as the frontrunners in negotiations for Mbappe, with the French star's contract expiring in the summer. 

From this month, the 25-year-old has been able to speak to clubs outside of France, but a conclusion doesn't look like nearing anytime soon.

Indeed, negotiations seem far from straightforward, with salary offers astronomical and competition rife. 

The latest detail to emerge from Mbappe's demands, though, highlights further complications with reaching an agreement.