Vialli feels that Giovinco, four strikes in 12 Serie A games this term, has to deliver more.
"Giovinco is always under exam," the former Italian international said. "Conte insists that Giovinco is fundamental to his team because of his assists. I think he will only be decisive when he scores
"He has the abilities to take the team by the hand, but he needs to be scoring key goals and doing that regularly."