Ousmane Dembele and Martin Braithwaite’s extra time struck Barcelona 2-0 against stubborn third division neighbors Cornella on Thursday to reach the last 16 of the Copa del Rey.

Barcelona missed two penalties in regular time. Midfielder Miralem Pjanic was thwarted by Cornella keeper Ramon Juan at the end of the first half before Dembele hit the 21-year-old’s feet from another free kick in the 80th minute.

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Dembele made up for it in the second minute of extra time with a vicious long-range shot involving Ramon Juan but unable to prevent his shot into the net.

Danish striker Braithwaite, who missed a clear chance to win late in regular time, sealed a nervous Barca win shortly after Cornella’s Albert Estelles was sent off.

Barca are the only survivors of the top three Spanish clubs in the round of 16 on Friday after Real Madrid were knocked out by Alcoyano on Wednesday while La Liga leaders Atletico Madrid were beaten by Cornella last week.

Barca coach Ronald Koeman was relieved to make it through to the next round but was frustrated with his side’s inability to finish the game well in advance, which meant they would have 120 minutes in a row after extra time in the Spanish Super Cup against Real played Sociedad and Athletic Bilbao last week.

“The most important thing is that we have made it to the next round, but we cannot be happy because we missed a lot of clear opportunities, missed two penalties and we have to show more responsibility in games like this,” he told reporters.

“We played 120 minutes again, that’s a big deal for us. And after we created so many chances and missed two penalties. It can’t be.”

Cornella’s coach Guillermo Fernandez Romo said his team have shown themselves proud but are still saddened they couldn’t quit the job.

“I don’t feel good about the result, but everything else I’ve seen tonight makes me proud. We played with dignity and I’m so impressed with my players because I have the impression that it’ll be 80 . Minute was an even game. ” he said.