Atletico Madrid president Enrique Cerezo has warned Chelsea they won't get their players on the cheap.
Diego Costa, Filipe Luis, Koke and off contract Tiago Mendes have all been linked with Chelsea since the end of the season.
Cerezo declared: "Players play where they want to play and if there's a player who is under contract and wants to play for another team, they already know what they need to do, activate their release clause and leave.
"The transfers are going very well, but I won't name any names, because then the player gets nervous and they leave with a bad feeling.
"For right now, Diego Costa is our player. He's with the national team and when a player is with the national team you can't bother him, we can't say anything and he has to focus on himself, in playing with the Spanish national team.
"We have not spoken with him."
