Williams, 21, extended his contract only earlier this year to 2027. But his buyout clause has remained at 50 million euros.
Relevo says Bayern have now expressed interest in Williams.
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The German giants rate the 21-year-old highly and are considering him alongside Dani Olmo (RB Leipzig) and Brajan Gruda (Mainz).
But Bayern sporting director Max Eberl wants to resolve their coaching issue before acting in the transfer market, but Williams is said to be a priority for the Germans.