The former Athletic Bilbao coach believes the teen could be led astray by hangers-on now attaching themselves to Yamal.
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He told Radio Marca: "He has tremendous talent, but you have to be very careful with your surroundings.
"Too many press conferences, too much exposure. Star players don't just come from one season to the next; they stay for fifteen or twenty years."
Caparros added: "He has to be careful with his surroundings and what he does."