The 18-year-old came on as a substitute in the second-half in los Blancos' 3-1 victory and was absolutely delighted with his maiden appearance.
"Debuting for Real Madrid was a dream come true," he said, according to the club's official website.
"I dedicate this night to my friends, the club, those who always stick by me, those who always cheer me up when I am down, to my parents and sister Marta who were in the stands.
"I wouldn't sell this shirt for 20 million, although my debut would have been much nicer had I scored. [Jose] Mourinho congratulated me once the match ended."