22-year old Courtois started this season as the Blues number one, displacing long-standing servant Petr Cech to claim the title of Chelsea goalkeeper.
Having spent a three-year spell away from the club, with La Liga champions Atletico Madrid the grateful recipients, the Belgian international made his first appearance for the Blues on the opening day of this Premier League season - three years after officially joining the West London club.
With a number of suitors after his signature this summer it was brave of head coach Jose Mourinho to name Courtois in the starting line-up for the Burnley game, but his faith was rewarded, as Courtois conceded just once to keep a surprising attack-minded side at bay.
The knowledge that he was set to start for the Blues seemed to convince the youngster to agree to a new contract, and he revealed that he was set to sign one when he returned from international duty with Belgium this week.
And now, Blues fans will be delighted to hear that Courtois has agreed a new deal with the Blues - signing a five-year extension.
Speaking to Chelsea TV, the stopper revealed his personal delight to have signed a new deal, allowing him to focus upon the football once again.
He said: “I’m very happy with this new deal, it’s very nice to sign here a contract for five-years.
"It was already sorted out, but now it’s also nice to be here for five more years, and now I can concentrate fully on the games that come. I’m very happy to be back at Chelsea and to play the games.
"I knew what it was like to play at Stamford Bridge, but not as the home team, and now I know what it feels like to play here - and it’s a really great feeling.
“And I just hope that we can win a lot of games and trophies.”