Could there be a possibility that they try to get around this by selling him for cheap but selling another player way above his market value? (re. MG sell-on clause)
I was thinking I bet there is a way they end up not paying any future transfer fee.
Hopefully it’s a water tight contract and we get a good future amount. You can’t see him staying at Marseille more than a couple of years, so no chance he runs his contract down and leaves on a free.