Real Madrid goalkeeper Iker Casillas has told Canal Plus the fans were "entitled to complain" after he was whistled at the Bernabeu during the 2-1 defeat to Atletico Madrid.
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Casillas and Karim Benzema were the focal point of the frustration from a significant portion of the supporters during the derby defeat, which leaves the European champions -- who were also beaten by Atletico in the Super Cup -- with three points from their opening three games.
"The fans are disappointed with the team and a defeat for Madrid hurts them as much as it hurts us," Casillas said, according to AS. "We're disappointed for the club and for the supporters. We didn't play as well as we needed to and it was the same situation in San Sebastian against Real Sociedad."
He added: "The fans' views are to be respected. If they feel the need to whistle then we need to accept this and keep working hard. We need to change the dynamic. They're entitled to complain and my way of responding is the only way I know -- playing football."
Atletico were once again able to hurt Real through their use of set-pieces, and Casillas -- whose place in the team is under threat from new signing Keylor Navas -- said he accepted his part in the defeat.
"I understand the paranoia that we are suffering as we're conceding goals from dead-balls and as goalkeeper I accept responsibility," he said. "I'll take my portion of the blame. We as a team, however, need to find the answers as the problems are starting to accumulate."
Real boss Carlo Ancelotti, though, insisted Casillas was not to blame for Tiago's opening goal.
"When you lose a goal at the near post, the last one responsible is the keeper," he told his postmatch news conference.
Ancelotti also claimed he "didn't hear" any whistling directed at the goalkeeper.
"I don't know if he was whistled," he added. "I'm focused on the game, thinking about tactics, not what's happening in the stands."
Ancelotti had said he could not understand the fans' whistles when they were directed at Cristiano Ronaldo during a match in March this year.