The Serbian midfielder had previously been linked with a number of European clubs, with his agent Marko Naletillic confirming the interest.
"On the players there are Inter Milan, Liverpool, Valencia and Olympique Marseille," Naletilic told fcinternews.it.
"The Inter proposal is the one that most fascinated Kuzmanovic but other outfits offered more money. I am in Germany and I'm dealing with Stuttgart over the Zdravko transfer, there are still some details to discuss.
"I don't know yet if the player will leave now or in June. Today [Wednesday] will be a decisive day."
Kuzmanovic will be out of contract in the summer.