The Montenegrin star has been continually linked with a move away from the club this summer, with Juventus said to be in pole position.
However, reports in Italy claim Manchester City, having missed out on Isco to Real Madrid, are now ready to turn their attentions to Jovetic.
Speaking about Juve, specifically, Della Valle confirmed that the price on Jovetic's head had not changed.
"They must give us €30million or nothing. Otherwise we will give him to someone else," Della Valle told Mediaset Premium.
"It must be understood if they (Juve) have money or not. In my opinion they have. We don't accept players. And we won't go under €30million."