The teenager has impressed during Real Madrid's pre-season leaving many to believe that he could force his way into Zinedine Zidane's plans.
Though the initial idea was for Kubo to work under Raul's orders at Real Madrid Castilla, Valladolid have made a request and Los Blancos have accepted it, according to Spanish TV show El Chiringuito.
Valladolid owner Ronaldo is said to have asked for the 18-year-old himself, and the good relations he holds with his former club could prove vital in landing the Japanese international on a temporary deal.
