“It's one of the worst nights in my career," said the Spaniard.
“It's difficult to explain what happened. "The first five or six minutes went well but that is not enough. It is very frustrating and disappointing. We're conceding a lot of goals and we cannot accept that.
"When you lose 6-0 we have to accept we didn't play well and made errors. We knew it would be tough.
"When we won at Stamford Bridge it was because we played well and were together. Today was not the case.
“All I can do is apologise to the fans because it's not acceptable."