Sancho has had a falling out with Manchester United manager Erik ten Hag who has banished him from the first-team squad.
The winger has been refusing to apologise to the Dutchman and the club are now preparing to let him go in the January transfer window.
Dortmund were tipped as one of the clubs who are interested in taking Sancho back but the Bundesliga giants are not interested.
While the financial aspect of the deal is daunting for Dortmund, according to German magazine Sport Bild (via Fussball Transfers), the England winger’s personal conduct is also an issue for the Bundesliga giants.
There were complaints about Sancho’s lack of discipline and sometimes unprofessional behaviour even when he was at Dortmund.
BVB were not pleased with the winger’s lack of professionalism in some instances.
That has been a problem at Manchester United as well, which forced Ten Hag to read the riot act to Sancho.
Dortmund are also not keen to meet Manchester United’s €60m asking price for the player.