Courtois is on-loan with Atletico Madrid this season, but admits his future is undecided.
"We have to see what is best for me, for Chelsea and also for Atletico. I believe that if I cannot play for Chelsea, this is where I where I should be. If we continue like we play, we'll make the Champions League, which is important to me and the club.
"It's important for me to have that experience and if I can return I'll be very happy here."