La Gazzetta dello Sport says Juve are aware of United's interest and are preparing for the Brazil defender's sale.
Juve will seek top price from United for Bremer and use the cash raised to bid for Bologna defender Riccardo Calafiori.
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Bologna signed Calafiori from FC Basel last summer. The 21-year-old has a contract until the summer of 2027.
Bologna are said to demand between 25 and 30 million euros to sell Calafiori after the season.