Speaking on Cadena SER's EL Largueroshow, the right-back said: "People have to understand that it's complicated. He's an 18-year-old kid who's already a key player at a club like FC Barcelona, which is one of the best in the world. He's making a difference, he's signed an important contract, his impact has increased dramatically, and well, in the end, it's not easy to manage.
"He'll make mistakes, as we all have. But, in the end, if you perform on the pitch, give it your all, and then have the quality he has, which is undeniable, then in the end he can become a player who can mark an era."
Despite all the praise, Carvajal seemed to avoid engaging in a Ballon d'Or discussion. "He could be among the candidates for the Ballon d'Or, especially because of his youth," the veteran defender said. "In the end, let's not forget that he's 18, and that I was at Castilla when I was 18, so it's very difficult to make a difference at that age in professional football. Since I'm not going to vote, I'm not going to give it to anyone because I'm not the captain, so I'm off the hook."