Real Madrid coach Carlo Ancelotti offered no excuses after their derby defeat to Atletico Madrid.
Diego Costa grabbed the only goal of the game.
"We were slow in attack. We didn't have a good game. We have to recover and improve," said Ancelotti.
"Losing a match at home is not easy. I have to think about solutions. We played well up until last week. We have to continue working with the same system but I'm confident we will improve.
"We must improve a lot of things including our attitude and confidence. I have faith in my players. The problem is not our style of play; it's with our pace."
