Hamsik's future is at the centre of mass speculation today after he seemed to open the door to a Milan switch this summer.
"I'm telling the truth when I say that Hamsik is not for sale," De Laurentiis told Marte Sport Live on Tuesday.
"However, when I receive an indecent proposal I'll listen to it, but it has to be the kind of offer that takes my breath away.
"I repeat that, for me, he's un-sellable, but if someone wants to sit at my table then they need to know that it is an expensive one."
"But, as I have said, I would need indecent proposals to arrive first."