to drop their asking price for Kevin-Prince Boateng after the midfielder aggravated a knee injury during his loan spell in Germany.
The 22-year-old flop, who joined the 1997 Champions League winners in January, could be ruled out for the rest of the season as a result of the injury and Dortmund general manager Michael Zorc believes Boateng's price should be reduced as a result.
Tottenham signed Boateng from Hertha Berlin for £5.8m in the summer of 2007, but the former Germany Under 21 international struggled to make an impact at White Hart Lane and is expected to be offloaded at the end of the season.
Loan ranger: Tottenham reject Kevin-Prince Boateng
But Dortmund insist the midfielder is overpriced and will not agree a permanent deal unless Spurs lower their asking price.
Zorc said: 'We had wanted to wait until the end of the season to see how things went with Kevin. He is overpriced. He will not be able to show what he can do in the Bundesliga now, so perhaps that will make him cheaper.'
Boateng, signed by former Director of Football Damien Comolli while Martin Jol was in charge, managed just 10 starts during his two and half year spell in north London.
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