I don't think that's quite right. When we have an option to extend a player's contract, it is our decision and ours alone as to whether we do that. The player cannot opt-out of the contract extension and therefore we have the power. In the case of a buy-back clause, it would usually mean that if the selling club wants to buy the player back, they can do so for a pre-arranged fee (so even if the player is 'worth' £20m, if the clause says £5m we would have to accept it) but the player still has the option of rejecting the deal, meaning it is the player who has the power. Obviously we don't know the exact nature of the clause in this instance, but I would be surprised if either Everton or Deulofeu agreed to a contract where they do not know what the future holds for them.