Atletico Madrid president Enrique Cerezo is optimistic Diego Costa will rejoin the club possibly next year but admits that it will be a complicated piece of business.
Costa is holidaying in his native Brazil having been told by manager Antonio Conte he has no future at the club and has been linked with a move back to Atletico, with whom he won La Liga in 2014 before joining Chelsea.
Atletico are not allowed to field a player until January 1, 2018 due to a FIFA transfer ban, meaning Costa will have to play the first half of the season elsewhere before switching to the capital.
The Atletico chief told Spanish media outlet Cadena Ser: “He has a contract with another club, it’s a complicated matter.
“We are taking things calmly. But as long as Chelsea do not agree to his transfer, Costa will be a Chelsea player.”
Asked if he was pessimistic or optimistic on agreeing a deal, he added: “I am always optimistic. On holiday it is normal to get a little fat but I understand Costa is a professional.”
The transfer window closes on Thursday night across Europe.