The 21-year-old Belgium international has spent the last two seasons on loan to Atletico Madrid and agreed a third loan spell to the Vicente Calderon Stadium this summer.
Chelsea had been keen for Courtois to get Premier League experience, but the youngster was adamant he wanted to stay in the Spanish capital and is confident he can usurp Cech when he returns from Atleti.
|8/1||Belgium are 8/1 with William Hill to beat Scotland 2-0
"But I was not interested in this option, I feel good in Madrid and wanted to play in the Champions League with Atletico.
"I was not afraid of fighting for a spot with Petr Cech. I have no fear of anyone, I believe in my qualities."
Courtois had no interest in playing understudy to the Czech Republic international this season, especially as he looks to cement a place in the Belgium national team ahead of the 2014 World Cup.
"I could have gone [back to Chelsea] and it may have worked out perfectly, but then again I may not have been playing and could have risked losing my starting place with the national team," he added.
"It would have been a risk for the World Cup.
"Next year? I can afford to take more risks. But for now, the important thing for me as a young player is to reach a higher level."