Courtois, 21, joined Chelsea back in 2011 having impressed for Belgian side Genk, where the shot stopper had made his debut aged just 17. Courtois arrived in West London aged 19, and was subsequently seen as the eventual successor to long-serving Blues goalkeeper Petr Cech.
The Stamford Bridge outfit decided to accelerate Courtois' development, sending him out on loan to La Liga side Atletico Madrid, and after starring in his first season in the Spanish capital, Diego Simeone's side extended the stay by another year, where the Belgian No. 1 again showed his potential.
There were huge questions posed over Courtois' future when Chelsea re-appointed Jose Mourinho, but they were dealt with swiftly as the former Real Madrid boss allowed Courtois to spend another season at the Estadio Vicente Calderon, taking the full loan to three years.
But now with that loan set to come to an end, Courtois wants his future settling for good, leaving Mourinho with a tough call - to stick with Cech or bring the future of the club into the present day and start Courtois - which is simply an embarrassment of riches, in truth.
The decision wasn't expected to be made until after the World Cup this summer, but Spanish newspaper El Confidencial believes that Mourinho has made up his mind - Courtois will be his starting goalkeeper starting from next season.
The report, run by Antonio Sanz, formerly press officer at Atletico Madrid and friend of current Chelsea striker Fernando Torres, states that Mourinho has grown tired of Cech's mistakes this season and believes it is time to let Courtois start between the sticks for Chelsea having established himself as the top young goalkeeper in Europe.
The decision makes sense; Cech is almost 32 and you could certainly make a case that Courtois - 10 years his junior - is already better than the Czech Republic international, and that Chelsea should harness Courtois' potential and cash in on Cech rather than waste Courtois' ability and persist with an ageing Cech.