Despite going down 3-1 in their second leg at Valencia's Mestalla stadium, Mbia's dramatic late strike set up a final showdown with Benfica on May 14 after the Portuguese club eliminated Italian side Juventus 2-1 on aggregate following a 0-0 draw in Turin.

Sevilla were favourites to advance against their La Liga rivals after winning last week’s first leg 2-0 at home but a 14th-minute Sofiane Feghouli effort, an own goal from goalkeeper Beto in the 26th and a Jeremy Mathieu blast 21 minutes from time put Valencia 3-0 ahead on the night and 3-2 ahead overall.

They were just over a minute away from going through to the final when Federico Fazio flicked on a long throw and Cameroon midfielder Mbia rose to crash a header into the net and silence the Valencia fans packed into the Mestalla.

It was a triumph for Sevilla coach Unai Emery, who never completely won over the Valencia fans when he was in charge there from 2008 to 2012, and he celebrated Mbia's goal wildly on the side of the pitch.

"This is a unique experience," Emery said in an interview with Spanish television.

"We don't care who we are playing in the final, we just have to enjoy this," added the 42-year-old former Real Sociedad midfielder.

"Now we have to beat a great team (Benfica) because they have beaten Juve, who are also a great club," Emery added.

Valencia forward Pablo Piatti struggled for words in a TV interview immediately after the whistle and said he and his team mates were "feeling the pain" and "in a bad way".

"We tried, we gave it everything and they scored against us in the last minute. We are happy with the work we put in but it was pointless in the end," added the Argentine.

(Agencies)

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