By ESPNSTAR.com staff
Cassano was a youngster at Bari and came on to score in his debut against Inter Milan. He has returned to the Nerazzurri this year after stints with Roma, Real Madrid, Sampdoria and AC Milan.
The Italy international was widely hailed as one of the most talented players of his generation but Fascetti, who mentored the striker, finds greater promise in Napoli's Insigne.
The 21-year-old has been given a run in the first team after impressing in loan spells within the Serie B with Foggia and Pescara. In the Serie A, he has yet to replicate the rich goalscoring form he demonstrated as a teenager with only three goals produced thus far but Fascetti remains confident that Insigne will blossom into a talented forward.
"Insigne played very well for Napoli against Inter on Sunday," Fascetti told Radio Kiss Kiss.
"The fact he played like that in his first San Siro outing shows he's got character. Lorenzo runs more than Cassano and is more generous with his teammates. He could mark a golden era in Italian football.
"I believe Insigne will be even better than Cassano. He is certainly better than Ezequiel Lavezzi, so Napoli did well to sell the Argentine.
"When I see a 20-year-old lad play like that at San Siro, which is like a young tenor performing at La Scala, I realise Insigne is destined for greatness.
"He is a world class talent and looks like he has been playing for a decade. If you don't pass the ball to Edinson Cavani, then you've got grit.
"If you believe in young talent, then you've got to let them play. Just look at Stephan El Shaarawy at Milan, as he would never have found space had Zlatan Ibrahimovic not left and Alexandre Pato stayed fit."
The Italy under-21 international, for his part, also spoke confidently of his side's chances of winning a Scudetto title. This proclamation comes depsite the fact that Napoli's 2-1 loss at the San Siro sees them go five points behind league leaders Juventus.
"We believe in the Scudetto," he said.
"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're focus on beating Bologna this weekend."