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In two his World Cup matches, Casillas, who lifted the World Cup as Spain’s captain four years ago, conceded seven goals in total, and his former team-mate believes he has to take responsibility for his performances despite the all-round poor standard of some of his compatriots.
"In Brazil, it is said that when you win, everybody wins and loses together," Carlos told Sport. "Iker, as has been spoken about, was not at his best, but the others didn't help him either.
"There are two people on the field who can do no wrong. The striker and the goalkeeper, when they make mistakes, it's very noticeable and gives way to criticism.
"Iker has to take responsibility. As a friend, I'm sorry for him and for the team, but you have to always improve as we do not live in footballing past, but in the present."
Carlos claims "strange situations" were responsible for Spain's elimination and says he does not believe their footballing style has not been brought to an end.
"The style of play or the tiki-taka is not over. Spain, like Brazil, has its style. Pass, pass and pass, slow play, which comes from 1970."
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"What has surprised me the most is James Rodriguez," he added.
"Colombia are a good team. The team is good, but not just James. James is very good, a great player, as we have already seen in Monaco.
"James can see the true feeling of the moment, like Neymar or Lionel Messi. He's at Monaco, a great team, a strong team in France. We can talk to Florentino, Florentino can do everything!"