The Portuguese Premeira Liga leaders showed their pedigree at the Lane with a 3-1 win in the first leg last week.
Benfica are unbeaten in their last 22 matches in all competitions going back to November - winning 20 - and players and management alike realise we have a tough task to reach the quarter-finals, but as Nacer pointed out, not an impossible task.
"We lost 3-1 at home so we have to win 3-0 there, it’s not impossible but it’s very tough," he said.
"We have the quality to win and we’ll go for it. We’ll see what happens. Playing at Benfica isn’t easy for any team but we have to score those goals and score as soon as possible. If we can do that, we might have a chance.
"We can’t give up because we still have 90 minutes to fix it and we will believe until the last minute."