Giovinco has been linked with a return to Juventus.
"We have a good relationship with Giovinco," said Ghirardi. "He knows that we rate him and that he can be a protagonist with this club.
"However, he knows that he still has to grow, but he's a humble kid who doesn't get carried away by enthusiasm."
Giovinco has caught the attention of a number of clubs this term, seeing as he's actually the Serie A top scorer thanks to his five goals.
"It's satisfying to know that clubs of international stature have their eyes on him," continued Ghirardi. "It means that we made a good investment."