They go into the game unbeaten.
Navas said ahead of Saturday's game: "We haven't lost in the league and we are full of hope.
"It's a very important game, we are deservedly up there and winning the three points would be a great step forward. And, even though Barcelona are a great team, we are going to make it difficult for them.
"It's complicated, but they've already drawn two games in the league. I think we are going to have our chances and we have to take advantage of them."