The Costa Rican goalkeeper is among those to have been booed at Santiago Bernabeu, but he intends to silence the fans while playing for his future Keylor Navas has vowed to “change whistles into applause” at Real Madrid after being targeted by certain sections of a disgruntled fan base. The Costa Rican goalkeeper has found himself in the firing line as a result of some disjointed performances from Zinedine Zidane’s side.