The Barcelona goalkeeper has offered words of sympathy for the opposite number of his arch rivals after losing his place at the Santiago Bernabeu
The Spain international was replaced by Antonio Adan for the 3-2 defeat to Malaga, with some quarters of the media suggesting a breakdown in his relationship with coach Jose Mourinho was responsible for the move.
Those allegations have since been dismissed by both parties and Valdes, whose Barcelona side sit 16 points clear of Madrid in La Liga, offered words of sympathy to his opposite number.
"Casillas has my full support," he told reporters at a press conference.
The Catalan keeper also spoke glowingly about coach Tito Vilanova and defender Eric Abidal regarding their respective battles with health problems.
"Tito Vilanova and Eric Abidal are both role models for the team," he added.