The 33-year-old Casillas made a public apology after the humiliating defeat on Friday night in Spain's first game at the tournament. Del Bosque said the whole team must be held to account however.
"If a team loses it's not down to the performance of a single player," said Del Bosque when asked if he would drop Casillas for Wednesday's crucial Group B game against Chile at the Maracana stadium in Rio de Janeiro.
The Dutch claimed emphatic revenge in Salvador for their defeat to Spain in the 2010 World Cup final in South Africa. Robin van Persie and Arjen Robben both struck twice. Van Persie scored one of the best World Cup goals ever when he hurled himself at a lofted long ball to head over Casillas. That levelled the game.
The Dutch scored four second-half goals, leaving Spain almost certainly needing to beat Chile and Australia to keep alive dreams of defending their title.
The whole of Spain was shellshocked by the defeat. Madrid sports daily Marca mourned "a historic catastrophe", dubbing the Netherlands' performance "a goal-scoring spree of Biblical proportions".
-- Casillas seeks forgiveness --
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Spain were "hammered", Del Bosque said after the match.
Spain conceded just two goals at the last World Cup and leaked only three in their qualifying campaign to reach Brazil, leaving Del Bosque at a loss to explain how they let in five this time.
Casillas was devastated by the result. "I have to ask forgiveness for the match we played in general and me in particular," he said after. "I was not good enough.
