The Belgian made his first Premier League appearance in Monday night's 3-1 win over Burnley at Turf Moor.
Jose Mourinho has confirmed that Thibaut Courtois is his new first choice goalkeeper, breaking Petr Cech's 10-year stranglehold on the Chelsea goalkeeper's jersey.
Courtois returned to Stamford Bridge after two years on loan at Atletico Madrid and is now the club's preferred netminder.
"Obviously a goalkeeper is not a player you are changing match after match, you must give a bit of stability, but this is about performances," said Mourinho.
The 32-year-old Cech has won three Premier League titles, the Champions League and the Europa League with Chelsea but Mourinho says it's now the turn of Courtois, 10 years his junior.
Mourinho told Cech the news on Monday morning.
"Ten years ago I had a very difficult decision to make when I had Carlo Cudicini giving fantastic performances in Chelsea's goal for many years," said Mourinho.
"I made a decision for Petr in 2004-05 because I had in my hands a keeper who I thought could be in Chelsea's goal for many years.
"This situation is similar. We have to think about the future of the club and I made a decision to give the goal to Courtois."
