The Partenopei travel to Germany on Tuesday looking for the win that would see them make the round of 16.
But the Spanish tactician has conceded that the Bundesliga team are ‘of the highest level’.
“We have great respect for Dortmund,” he told a Press conference. “We are talking about an opponent of the highest level.
“We’re looking forward to measuring ourselves against a great squad. We need the whole team to do a great job defensively if we want to do well.
“It’s a very important game for us tomorrow. We’re coming up against a great side, but we have to stay calm and focused if we want to do well.
“We’ve played a lot of games this season at a very high level, so it’s only normal that we would drop off a bit.
“But we’ve been training at our very best ahead of this match.”
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