Leon took part in their 1-0 win at the Bernabeu.
"In a game there are moments when you do not play well. The important thing is to win three points. We are improving. We still have to be a hundred percent, but we're happy to win," said Leon.
"We cannot look at Barcelona, but ourselves. We have to improve, we must continue in the ascending line in this league.
"Anybody can beat you. A newly promoted can beat you at home."