The impressive Belgian has been linked with a permanent move to Atletico, with rivals Real Madrid also set to enter the race for his signature.
Chelsea are sticking by Petr Cech as their number one and so Courtois is still having to play the waiting game to become the number one at Stamford Bridge.
Cerezo knows that the decision is in Chelsea’s hands and that the stopper wants to make his mark in England after the World Cup in Brazil, so a fourth loan season or permanent deal is unlikely.
“Courtois is Chelsea’s property and that has been made clear.
“Initially he was loaned out to us for a year but now we’ve had him for three seasons.
“Thibaut is very pleased to be at the Vicente Calderon right now although he is prepared to fight for his place with Petr Cech at Stamford Bridge.
“His future does not depend on us, so we have a big challenge over the summer to strengthen our squad.”