Chelsea players know they can't be complacent over their Champions League lead on Benfica.

A warning that Benfica still pose a threat came from ­defender Paulo Ferreira.

He said: "We know they are capable of scoring away from home. So we need to be careful because they will not think it is over yet. We have the upper hand but they only need one goal and we are all equal. We have an inner strength here at Chelsea and of course I still believe in the team.

"We have wonderful players and we have to keep believing."