Schlotterbeck, who has a contract to 2027, could be on the move in January, says BILD.
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Two options are being considered by the defender - either a move to England or Bayern Munich.
Bayern were very close to signing him in 2022, but he ultimately opted to stay at the Strobelallee stadium.
In England, Liverpool are watching Schlotterback's situation closely.
BVB would prefer to extend Schlotterbeck's deal than sell, but the former option is no longer a certainty.