It may not be an easy task for sure, but with team effort and with coaching strategies, I would say, they can win on the game. Let us see. Chelsea, is the slight favorite here but they should not be too confident as Benfica is also strong. Just consider Pavlidis from Benfica. And you won't think that Chelsea can win easy on this match.
I noticed something from Chelsea since this current coach took over, it is very difficult for small team like Benfica to defeat Chelsea in this UEFA champion league because they know it will be a disgrace to allow such thing to happen, Chelsea will definitely win this match to defeat their opponent to make their fans happy because what happened in the home of Bayern Munich will not happen in this match which is my prediction, i understand that Benfica will play this match just to reduce Chelsea points from the second match, but Chelsea players will not going to make such mistake in this match because opportunity for Chelsea to win this match is in their coach hand, he need to use their talented players to start the match.