Luiz has stressed the importance of not just winning the tie, but going on to lift the trophy.
"This is a great opportunity to win another European title," he told chelseafc.com. "Last season we won the Champions League, which we were all happy with.
"We want to win titles, and that's how you have to think at a big club. Tomorrow is a chance to win the first leg and we want to go on and win the Europa League.
"It's important to show the Premier League is the best league in the world, and we have an opportunity to prove that. Tomorrow will be a difficult game, Steaua Bucharest are a strong team and we need to be focused from the first minute until the last minute."