Despite the club falling 22 points behind league leaders United in the top flight, they managed to book their semi-final place at Wembley with a narrow 1-0 win over them at Stamford Bridge courtesy of a wonderfully-crafted Demba Ba goal in the second half.
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"It's very important to play European football because you are playing against some of the best players in the world and teams from different countries," Luiz told the club's official website.
"There is a bit of a difference in terms of style and culture. In Europe, each team is different.
"You can play against a Spanish side, or a Russian side, like we will tonight, and the way they play football can change.
"They've already beaten two good Spanish sides [Atletico madrid and Levante]. To arrive at this stage of the tournament they are obviously a very good team.
"We need to be careful, play an intelligent game and not concede any goals, because that's very important when you play the first leg at home.
"Everybody's confident, when you beat a big team like Manchester United it's good for you mentally,' he explains.
"This competition is important for the club, the players and the fans, but it will be a difficult game against a team at a high level."