Possibly. I imagine a footballer may have their contract paid up if they're sold by the club or, alternatively, forego any outstanding payments if they ask for a transfer.....which is probably why players are reluctant to put in a transfer request. Football agents are far smarter than I am so there'll be all sorts of contract clauses designed to benefit both the star and the agent. The club will push for similar clauses to suit the club. The final contract will be a compromise. I think my initial point stands though......a higher fee doesn't necessarily mean a better deal.