The striker has struggled for regular first team action this season.
"Lorenzo's future is absolutely with Napoli," Fabio Andreotti told Radio Kiss Kiss. "Lately there have been many, many rumours, but they are not true.
"It is obvious that Lorenzo will do anything next year to claim a place in the World Cup squad. But we think that Napoli is the best place to do that.
"He has felt a huge responsibility on his shoulders this year, but he is living a fairy tale.
"It is a dream that we hope never ends."