Eintracht Frankfurt sporting director Fredi Bobic admits they face losing Luka Jovic this summer.
"We don't need to sell anyone for financial reasons," Bobic said.
"But anything can happen. We could even lose all three [forwards].
"I can guarantee that the three will really enjoy playing for Eintracht, but other forces could come into play at any minute and there's nothing we can do if they decide to leave."