Recent reports have suggested that Germany international defender Sule will move to the defending Bundesliga champions at the end of the season in a deal worth €25million.
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However, Chelsea and Paris Saint-Germain are also thought to be interested in the in-demand 21-year-old, which has supposedly prompted Hoffenheim to ask for a larger fee.
And Hoeness admits Bayern and Hoffenheim are still some way off concluding a transfer.
“There are still big problems,” Hoeness told Kicker.
“The transfer fee could seriously endanger the deal.”
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Sule has a contract with Hoffenheim until 2019.
Bayern have also been heavily linked with Hoffenheim midfielder Sebastian Rudy, whose deal with the Sinsheim side expires in June 2017.
