A first-half own-goal from Danilo and second-half strikes from Stevan Jovetic and Vicente Iborra had put Sevilla into a 3-1 lead with 13 minutes left.
However, a Sergio Ramos penalty and a 93rd-minute Karim Benzema effort ensured that Real won the tie 6-3 on aggregate.
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REAL MADRID XI: Casilla, Danilo, Ramos, Nacho, Marcelo, Kroos, Casemiro, Asensio, Vazquez, Morata, Diaz Meija
He told the club's official website: "Hopefully we can give people what they want to see, but I will not make promises that cannot be met.
"I hope we have a very good night to achieve a result against an opponent which is one of the best in the world today."
"The idea is that everyone is important. Although we have won 3-0 in the first-leg, we're always going to use our heads and respect everyone," he told reporters this week.
"From here to the end of the season, we'll have difficult matches - this is one of them and we'll always have to fight."