The French winger's future has been the subject of conjecture this summer, with Birmingham having seen an offer rebuffed by the Latics.
Juventus have recently been linked with an approach, and N'Zogbia's agent, Franck Peslerbe, has failed to quell rumours of interest from the Serie A giants.
Peslerbe told tuttomercatoweb.com: "Juventus and N'Zogbia? I cannot rule out that Juve have been monitoring him.
"I don't know if Juventus have contacted Wigan, I have not heard anything. Charles had a great season with Wigan. Right now there are mainly Premier League clubs following him, but of course, Juventus are Juventus.
"But I repeat, I know nothing."