Atletico appear Barcelona's nearest rivals this season.
"Our campaign has been fantastic so far, we're playing a very attractive brand of football and the whole team is hoping the rest of the season will be great too," the 26-year-old told l'equipe.fr.
"We're doing well just now, but we need to make sure we don't let ourselves slip. It's still early for title talk, but I'm convinced that we'll be up at the top. Our priority is still a Champions League place."