Speaking to Relevo, the 50-year-old said: "Things started very early with him. He has to pay a lot of attention so that the emotional part doesn't affect him. He's going to have moments of ups and downs, that happened to me.
"You have to keep a cool head, strong. If not... it's complicated. Endrick has enormous potential, he has a lot of technical quality, strength, speed and goalscoring. He has to be calm, work, work and work. The mental part is basic, fundamental."