The two sides, who have drawn four times across three separate competitions this season, are currently level at 1-1 from the first leg at the Camp Nou last week.
"The fans will be very important for us tomorrow. We made people believe and I think we are going to see Atletico's best from now," he told reporters at a press conference.
"It's going to be an important match for the club's history and we want our fans to enjoy it."
Atletico currently top La Liga with six games remaining.