The full-back has revealed his desire to one day move back to his boyhood club, while believing that his spell in Germany has helped him to fulfill his potential
The 21-year-old left the Santiago Bernabeu last summer in his bid for regular football, and quickly nailed down a spot with the high-flying BayArena side.
And after amassing 32 appearances en route to securing Champions League football for the Werkself next season, Carvajal believes he is playing the football of his life.
"Going up against world-class footballers makes you improve. I've fine-tuned the points where I was strong," he told Marca. "Tactically speaking, I'm better.
"I have faith in myself and I feel ready to go back to Real or to play in the Champions League with Leverkusen. I think of myself as a Madrid supporter. I was born a Madrid fan.
"I wore the shirt for 10 years and Madrid is in my blood. At the moment, I'm with Bayer until 2017 and I don't know if I'll go back."
Los Blancos are reportedly keen on re-signing their youth team graduate in an effort to rejuvenate their squad following an underwhelming domestic and European campaign.