Off contract in June, the France international has so far resisted Bayern attempts to discuss new terms.
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TMW says Upmecano is fielding interest from across Europe and can commit to a pre-contract with any foreign club from January 1.
In Spain, Real and Barca are now intensifying their pursuit of Upamecano, with both giants spying a bargain basement opportunity.
Real see Upamecano as a potential replacement for veteran Toni Rudiger, while at Barca they remain in the market for a new centre-half after allowing Inigo Martinez to leave for Al-Nassr.