Toni has questioned the Azzurri's mentality.
"The beautiful thing is that [Serie A] is the only European League still up for grabs," Toni told RMC Sport.
“I didn't like the way Napoli decided to abandon cups for the League. That's not the right way to acquire a winning mentality, even if they're still a great team.
“Juventus are actually trying to move forward in every competition because of this ruthlessness in wanting to win everything.
“[The title race] will be a good fight until the end of the season."