The Belgian star also says that if the veteran 'keeper does decide to leave, it will be his decision alone.
The young Belgian returned from his loan spell at Atletico Madrid this season after a highly successful spell with the La Liga side.
Jose Mourinho immediately chose him as his number one ahead of club legend and fan favourite Cech, and he has not disappointed in his first season in England, finishing with 12 clean sheets as his side won the Premier League at a canter.
And speaking of the competition with the Czech, Courtois says that the duo work well together.
“I am strong in my head,” he said.
“We work well together. When you have to maintain such a level [of performance], it's hard. It pushes you to never relax. We are both decisive for the team.”
With Courtois having enjoyed such an impressive first season in England, it seems the number one spot at Stamford Bridge will be his for some time.
That has led to speculation that veteran Cech will look to leave the club in the summer transfer window as he seeks first team football, something he has become accustomed to during his stint in England.
Arsenal and Manchester United are favourites to sign him should he leave, according The Telegraph, and Courtois says if he does decide to leave, it will his decision alone.
“If he has to go, it will be his choice,” he added.
“Too bad that such a guardian is found on the bench. Given his level, I am happy with the season I've accomplished.”