Juve and the Azzurri are battling for Serie A leadership.
Reflecting on Monday's win over Genoa, Douglas Costa said: "These are satisfactions that help us to be even more focused and determined. The title race? It's very competitive and many teams are starting to fight for the Scudetto.
“In Brazil, we say that it's interesting when there's a 'hunt' going on at the top of the table because the League becomes more spectacular and the fans grow in the stadiums.
“Napoli? They're playing good football, but the best football doesn't guarantee success. Ultimately, winning counts. I like playing good football, but I prefer to win."