Chelsea boss Andre Villas-Boas knows his job future will continue to be subject of intense speculation after their Champions League defeat at Napoli.

Villas-Boas watched his Blues produce their latest defensive horror show to lose their last-16 first leg 3-1 and pile the pressure on their beleaguered boss.

"Speculation will continue as the results don't happen," Villas-Boas said.

"We have to solve these mistakes at the back.

"We need this concentration right and this efficiency right, for sure.

"At the moment, without John, a very important player for the team, we have suffered a lot of goals recently.

"We had improved a lot at the beginning of January, so we have missed John.

"But we have full belief in these players and we have to continue to work with them to get it right."