The Naples outfit have been firing on all cylinders this term and are five points from top spot despite falling to a 2-1 loss to Inter in their last outing.
But Insigne feels the Partenopei could spring a surprise come the end of the campaign.
"We believe in the Scudetto,” the 21-year-old told Sky Italy.
“We are not missing anything in order to take that big step forward.
“We played really well at San Siro and we were also a bit unlucky in that one. Now we are focused on beating Bologna this weekend.”It has been a notable season for the youngster so far, winning his first cap for his national side and establishing himself as a first-team regular, scoring three goals in 16 appearances.