Marca says Aguado has joined Best of You, which also represents Casemiro, Hugo González, Alvaro Arbeloa and Jacobo Ramón.
This move comes at a crucial moment in his future, with the possibility of a promotion to the first team or a move in the style of Jacobo Ramón, who is now with Como in Serie A.
Borussia Dortmund expressed interest in Aguado last summer.
Last season, as a second-year youth player, he was already called up nine times to the first team and even made his debut as a starter in the first round of the Copa del Rey against Deportiva Minera. He also made his debut under Raúl at Castilla.
This season he made the leap to the Real Madrid reserve team and has already been called up twice for the first team, against Benfica and Villarreal.