Branislav Ivanovic admits Chelsea's defence must tighten up if they're to stand any chance of beating Napoli.

Ivanovic acknowledged Chelsea could forget about becoming only the fourth team to overturn a two-goal first-leg deficit in the Champions League if they repeated last night's defensive horror show.

"I agree," he said. "We can't concede a goal at Stamford Bridge which will kill our confidence."

He added: "This is the hardest moment of my four years here.

"We haven't won a lot of games and our confidence is not in the best way.

"We must do all we can do to do well, we must keep going and be positive. This is the way to pass this critical period.

"If everybody works right, I think we can get a reward for our hard work."