Joe Hart of West Ham United looks on during the Emirates FA Cup Fourth Round match against Wigan Athletic.
Courtois is out of contract in 2019 and while the Blues are prepared to make the Belgian the highest paid goalkeeper in the world with wages of around £200,000-a-week in order to extend that, there are still fears a switch to Madrid could happen.
A dejected Chelsea goalkeeper Thibaut Courtois during the Premier League match against Watford.
In that scenario the West London outfit will move to sign Hart as a replacement, who will also enter the final year of his current deal at the Etihad Stadium this summer and is ready to leave having been deemed surplus to requirements by manager Pep Guardiola.
Currently on loan at West Ham United, on the face of it many might think the Hammers would be interested in making the England international's temporary switch permanent, but then things haven't really gone to plan at the London Stadium.
After being dropped from the starting XI against City on December 3 because he could not play against his parent club, Hart has not returned between the posts in the Premier League since with Adrian preferred, instead limited solely to cup outings.
David Moyes, manager of West Ham United, looks on prior to the Premier League match against Brighton and Hove Albion.
That was because the 30-year-old was widely criticised for his performances for West Ham during the first half of the season, which makes it all the more curious he is wanted at Stamford Bridge.
Either way, the East Londoners surely won't be putting up a fight?