The result means a record sixth final in the competition for Sevilla, who have never been beaten once making it to the last four.
"We've done it and now we have to rest, once you get to a final you want to win it," Lopetegui said joyously.
"We hugged in joy, we know everything this team has been through, today included and we have that resilience to grow against intensity."
He also praised Manchester United, who provided a difficult opponent to beat.
"It was a game of resilience, of being able to compete to the limit as we always do," Lopetegui explained.
"Manchester United were the best team in England after the return following quarantine, they have an extraordinary future ahead.
"There are few teams with the midfield play of Manchester United, in the first half we could control it and at the start of the second half we didn't but Bono was fantastic.
"After that we balanced things out and had chances to do them damage."
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