Former AC Milan sporting director Massimiliano Mirabelli says they risk losing Gigio Donnarumma and Hakan Calhanoglu in June.
The pair are off contract at the end of the season.
“We created the basis of this team with many renewals but now I hope that Donnarumma and Calhanoglu will remain," Mirabelli told Tuttosport.
“But for some time, they have had the advantage and the power of the situation.
“I'm amazed by the time, renewing so few months before the deadline will cost a lot. Milan has waited a long time, too long.
“Maybe the renewal arrives but you hurt yourself on the balance sheet."