Courtois says he will consider returning to Spain when his current contract with Chelsea runs out in 2018.
He told Marca: "I have a contract with Chelsea for three more seasons. In 2018 when I am in the last year of my contract we will have to evaluate if it is best for me to renew or leave.
"When I left Spain I already knew that one day I was going to go back."
Asked if he missed Atletico he said: "Yes, but not just for the club, for Madrid itself and for the whole country. From the first minute there I feel in love with Spain, with the people and the way of life. I still eat late, take a siesta and watch Spanish television. I feel half Spanish."