By FOX SPORTS staff
Dropped from the first eleven at the end of last year by then Real Madrid manager Jose Mourinho, Casillas was expected to seize his place between the posts back at the start of the season following an impressive Confederations Cup campaign with Spain.
However, Los Blancos boss Carlo Ancelotti opted for Diego Lopez during the team's 2-1 win over Real Betis in the opening weekend of La Liga, igniting speculation that Casillas could find himself relegated to the bench for another season.
Valdes told Marca that he was shocked to hear of his compatriot's omission from the starting line-up as he had little doubt Casillas deserved to start for Real.
"I was surprised. He looked good in the Confederations and during the recent national squad call up. I've seen Iker make saves that I didn't think were possible," Valdes shared.
"For me, he's the best, but I shouldn't say more as it's not my team."
With the current season expected to be heavily influential in the minds of national team managers ahead of the 2014 World Cup, former Real Madrid boss Bernd Schuster urged Casillas to consider his future at the Santiago Bernabeu.
"I'd understand it if Iker wants to leave, it was impossible to imagine Raul at another club, and it's the same with Iker, but this year there is a World Cup and he cannot afford to spend a year sitting on the bench. He has to play," he pointed out.
"Being the Madrid goalkeeper is a very difficult job and Iker is who he is, and a player as good as him cannot afford to be in a situation like this one."
Real Madrid travel to Granada for their La Liga fixture this weekend.