The Blues have kept three consecutive clean sheets after demolishing Manchester United 4-0 at Stamford Bridge yesterday.
And Courtois thinks the new 3-4-3 formation is having the desired impact.
“We started very well and we knew what we had to do,” he told the club’s website. “The first goal was an example of the work we’d done in the week, Pedro and Marcos Alonso did very well.
“Against Hull and Leicester I didn’t have to make many saves but against Man United I did”
Chelsea keeper Thibaut Courtois
“We started with the fans right behind us and it was hard for them.
“We scored the second goal after 20 minutes which was good and allowed us to control the game.
“In the second half they changed their system but we coped well and scored another two goals.”
Courtois has noticed Premier League attacks are finding it far harder to break down Chelsea’s defence.
“At the Euros I played for Belgium against Italy and Wales, who both used this system, and they were very difficult games.”