But with the second leg taking place at Stamford Bridge this year, Benitez knows how important a clean sheet will beahead of next week's second leg.
"We know that we need to score and don't concede if possible, then after we will see what happens at Stamford Bridge," said Benitez.
"We have some experience in Europe and if we get a good result here it will be easier, but we know it will be tough.
"I said before that they are very strong and we are too, so I think it could be very tight and less open.
"I think the key will be as always small details. I don't know whether the other games give us any advantage, they have some experience, we have some experience and we both have new players.
"We know the Stamford Bridge is a difficult place to go so tomorrow we will try we will try to score and not concede. That is the key if we want to progress."