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Cornella's Camp Municipal stadiumis situated less than 10 miles away from Barcelona's Camp Nou, making it a dream draw for the Segunda B side.
The two teams have never met in a competitive match, though Barca B are regular opponents ofCornella in Segunda B.
Koeman's side are currently third in La Liga after an inconsistent start to the season, though they are unbeaten in seven matchessince a 3-0 defeat against Juventus in the Champions League at the start of last month.
Asensational flick from Adrian Jimenez was enough to seeCornella through at the expense of a below-par Atleti in Catalonia on Wednesday
Saul Niguez hit the woodwork and Lucas Torreira went close with a free-kick, but the visitors could not find a way past a stubborn Cornella defence. Ricard Sanchez's dismissal for a second yellow card rounded off a miserable evening for Diego Simeone's side.
Simeone was magnanimous after the game, choosing to praise his opponent rather than criticise his side too harshly.
"They competed well and they played the game they wanted to play, and then kept it like that," he said."They had intensity and you really just have to congratulate them. When a rival outperforms you, you just have to congratulate them."
The lower-ranked sides will host the last-32 matches, which are to be played on January 16, 17, 20 or 21.