Porto travel to Spain with a 1-0 lead from last Thursday's first-leg clash, in which French defender Eliaquim Mangala scored a first-half goal before Fernando's late dismissal set up a nervy finish for the hosts.
Sevilla have home advantage in the second leg, though, and will feel confident after thrashing Espanyol 4-1 on Sunday.
"We've won at home (against Espanyol) and that gives us confidence," Emery said.
"The team is ready, with hope and ability, to deal with Porto. There are 90 minutes of work to come but we can do it with the support of the fans.
"Porto is Porto and they have shown on their pitch they are a very good team. We need more ways to win and we know our opponent will cause us trouble but it's a wonderful challenge."
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