He and his grasping agent are chancing their arm.They know there is no player out there who can fill his role at the moment and at 31,as good as he is,we wouldn't get top dollar for him.
They know if we want to keep him then paying him extra would be a cheaper alternative than buying a replacement and hoping it comes off.
We need to play hardball,we hold all the aces as his contract has three years to run.Tell PSG it is 35 million,take it or leave it and he is yours.If Luis is worth 50 million to them Ya Ya must be worth at least 35,he has at least three good years in him and can also move further back in his twilight years.