Branislav Ivanovic has said a lack of belief was to blame for Chelsea's first-half capitulation at Arsenal on Saturday.
Goals from Alexis Sanchez, Theo Walcott and Mesut Ozil put the Gunners 3-0 up inside 40 minutes as the home side capitalised on defensive mistakes to record their first Premier League win over Chelsea since October 2011.
Antonio Conte's men slipped to a second consecutive league defeat against a top-four rival, and Ivanovic -- who captained the team in the absence of the injured John Terry -- told Chelsea's official website: "We didn't start the game in the way we wanted.
"We didn't believe in what we were doing at the beginning and we were punished.
"As a team, we didn't answer anything the manager asked of us. We have to be honest with ourselves and put more attention on the small details. We have to be more focused and concentrated on the game.
"I know it's very disappointing and it hurts all of us, but the opinion of everyone in the dressing room was in the same direction.
"We have to build on that, stay together, work hard, and believe in what we are doing. I am sure we can come out of it stronger. We have to stick together."
After the match, Conte said Chelsea "are a great team only on paper," and Ivanovic called on the players to start living up to their reputations at Hull City next Saturday.
"In this league every game is a different story, but it doesn't mean you have to change your philosophy if you win or lose a game," he said.
"Our way of playing has changed a bit and you always need time. In the last two games it has not been the usual Chelsea way, but if it starts working it will be very good for us. We will be very, very dangerous.
"We have to believe in what we are doing, and the results of that will come."