And the Belgian international - currently on loan at Atletico Madrid - is willing to stall until after the World Cup to see what Chelsea plan to do with Petr Cech.
Chelsea have reportedly offered Courtois a two-year extension to his current Blues contract, and were keen to get a deal tied up before the World Cup in Brazil next summer.
But Courtois wants to wait to see what happens when he reports back to preseason training with Chelsea. The loan star wants the opportunity to make his case to replace Cech as Chelsea's number one.
The 21-year-old is currently mid-way through his third loan spell at the Vicente Calderon and is reportedly unwilling to go out on loan again next season.
His current Chelsea contract expires in the summer of 2016, but the uncertainty surrounding his future at Stamford Bridge has prompted speculation he could agitate for a permeant move.
Barcelona have been mentioned as a possible destination, with the first-choice Nou Camp stopper Victor Valdes set to leave the club at the end of the season.
Chelsea would demand at least £33.5m for the Belgian goalkeeper, and if Courtois were to leave Stamford Bridge, a return to Spain would be his preferred choice.
He's settled in Spain, and has blossomed into one of La Liga's most consistent goalkeepers in Madrid.
Chelsea are desperate to keep the highly-rated stopper at the club, but the report warns he will seek a permanent transfer if he's not first-choice at Stamford Bridge next season.