The Belgian international signed for the Londoners in 2011 but is yet to make a single appearance for the club after being loaned straight out to gain experience.
He has since impressed in his three seasons with Atletico, helping the capital-based club to mount a serious title challenge and enter the Champions League.
This has led to talk of a future at Chelsea, but the player himself has expressed reservations about a return.
Courtois is said to be wary of playing a backup role to established stopper Petr Cech, who has been a Stamford Bridge hero for some time.
Mourinho is known to be a fan of the 21-year-old, and is ready to risk making him his first choice in a bid to keep interest from Real Madrid at bay.
Courtois is one of Europe’s most highly-rated glovesmen, and is thought to be more than happy to pursue a long career with Chelsea as long as he is given game time.
Cech is a Mourinho favourite, but the veteran Czech Republic international has endured a relatively underwhelming campaign.
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