He said: "Fernando knows he is a key player for us, and he knows that if we play well he will score goals.
"Three times now in a week we play Arsenal, twice in Europe and on Saturday in the league, and I would expect Fernando to work just as he has done before.
"This, though, is Europe and I know he wants to play well and score more goals.
"The partnership between Gerrard and Torres is improving with every game. On the pitch they understand each other perfectly, they are both clever players and a it is easy for them to work together.
Benitez, who has only Daniel Agger and Harry Kewell missing ahead of the match, added: "It is the understanding on the pitch between Fernando and Stevie that is the key, and everyone can see how good that has become.
"The players believe Fernando will score, always. They have trust that if they get the ball to him and create chances for him, he will score.
"Stevie has said as much this week, and he is the closest to him; he can see the quality and ability from close quarters.
"He knows just how dangerous Fernando is. Not only in training sessions, but Stevie has seen Torres score 28 goals and he is impressed, he is giving credit that is due and we can all see it.
"Maybe he is better than when he was in Spain. It is different for him here, in Madrid he was going out wide to receive the ball, he was working hard to receive the ball.
"He was having to go at defenders from different positions. But here he has Gerrard close by, so he can stay higher up the pitch and wait for the passes, that has seen him score more goals."