Bayer Leverkusen coach Peter Bosz admits the club will likely lose Kai Havertz this summer - but only for 100 million euros or more.
The 20-year-old is highly coveted by Europe's top clubs, including Manchester United, Chelsea and Liverpool.
While Bosz admits a transfer could happen this summer, the Dutchman says Bayer will demand an enormous fee.
"Kai is 20 years old, but this is already his fourth season in the Bundesliga," Bosz told Dutch outlet Algemeen Dagblad.
"That says a lot. Everyone in Germany sees him as a child prodigy. He is from Aachen, has been here since he was eight. Nice boy to work with. Intelligent. He also plays the piano.
"We sold his buddy, Julian Brandt, to Borussia Dortmund last summer. Havertz suddenly became even more of an eye-catcher.
"A lot came to him before the winter break. We lost the derby at Koln and three days later also at home to Hertha Berlin.
"He can't be held on to next summer. That will be a transfer of €100 million. What am I saying? More than 100 million!"