The 22-year-old defender will enter the final year of his contract at Freiburg at the end of the season and he will not be signing a new deal with the club.
The centre-back is prepared to move on from the club in the summer and he has been linked with a move to England, where Newcastle are interested in him and Tottenham are keen.
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But Dortmund are the ones who are pushing to sign him and it has been claimed that Schlotterbeck has already given his nod of approval to a move to the Westfalenstadion.
However, according to Sky Deutschland, the two clubs are far apart in terms of their respective valuations of the centre-back at the moment.
Freiburg want around €25m for the defender before agreeing to let him go in the next transfer window.
Dortmund believe that the German club are asking for too much money for a player who will only have a year left on his contract.
BVB are being conservative about what they want to spend on Schlotterbeck and are aiming to sign him for less than €20m.
The 22-year-old wants the move but will have to wait for the two clubs to reach a compromise over the next couple of months.
And it remains to be seen if Newcastle, who want at least one centre-back in the summer, swoop in to take advantage of the financial differences.