REAL MADRIDBeep-beep: new Castilla signing Sergio Díaz in actionA look at 18-year-old Paraguayan forward Sergio Diaz, who has signed for Real Madrid Castilla for 5 million euros from Cerro Porteño.AStvUpdate: Jul 2nd, 2016 12:18 EDTAStvTagged in:Cerro PorteñoCastilla FCReal MadridTeamsFootballSports