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."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball