You aren’t only voiding the existing contract, you also have to pay the market rate for the player. The contract is between the club and the player, nothing to

You aren’t only voiding the existing contract, you also have to pay the market rate for the player. The contract is between the club and the player, nothing to do with the league. A club “owns” a player under contract, so if someone wants to buy the player, they can ask for whatever price they want and turn down any offer if they choose. Often the costs have a lot of conditions included to protect the buyer and incentivise the player. Such as more money after a number of games played and more money if they win a trophy etc.