An eighth and final chance remains in the Europa League, where they meet Tottenham's conquerors Basle in the last four.
"It's not difficult," the Brazil defender said.
"You need to take positive things. For us it was a great game. In the second half we controlled the game, we controlled one big team and created a lot of opportunities.
"In the future we have confidence. I'm always positive.
"We have important games in the future. We need to win. We need to be in the best position in the league and win the Europa League."