Cesar Azpilicueta called Chelsea's 6-0 loss to Manchester City one of his worst moments as a professional.
"It is one of the worst nights in my career. It is difficult to explain what happened. The first five or six minutes went well but that is not enough. We are conceding a lot of goals and we cannot accept that," said the Chelsea defender.
Azpilicueta then apologized to Chelsea supporters.
"All I can do is apologise to the fans because it is not acceptable."