Real Madrid goalkeeper Iker Casillas feels they're struggling to defend set-pieces.
Real were beaten 2-1 at home by Atletico Madrid on Saturday.
Casillas told Canal Plus: "I understand the paranoia that we are suffering as we're conceding goals from dead-balls and as goalkeeper I accept responsibility. 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."
He added: "The fans are disappointed with the team and a defeat for Madrid hurts them as much as it hurts us. 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."