Sevilla manager Unai Emery knows it will take a huge effort to overcome Porto at the Ramon Sanchez Pizjuan this evening.
Porto lead 1-0 after the first leg after Eliquim Mangala's header gave them a 1-0 win in Portugal.
"We'll have to take care that they don't score against us and we're closer to scoring goals ourselves, but we have to prepared if they score whether it's early or late in the game," Emery said.
Sevilla performed reasonably well in the first leg and they were unlucky not to take anything from the game after matching Porto for most of the 90 minutes.
Emery said: "It's going to be difficult, our opponent has the advantage and plenty of experience. To beat them we'll have to make a huge effort."
For Porto, the Europa League represents their last chance for a trophy given the Primera Liga is out of their reach.
"I expect Sevilla to be trying to win the match but they can expect the same thing from us. We'll try to win in a balanced way, trying not to forget our defensive system," Luis Castro told reporters.
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