Why are fees often undisclosed?published at 14:15 BST
Undisclosed transfer fees are really just a way of clubs keeping their cards close to their chest.
It means rivals do not know how much of their transfer budget Team A have spent, nor do they now how much Team B have to re-invest in a replacement player.
It all seems quite pointless in the modern era, where we generally get to hear about most transfer fees through agents or other sources.
Then there are the deals done with overseas clubs which are listed on the stock market, such as by Lyon and Juventus.
A Premier League club might list a deal as undisclosed, then the other club has to tell the stock market the exact fee and any variables. There's even less point in the English club holding back the details of the deal, but they still do.












