Borussia Dortmund have insisted they will need to renegotiate a deal for Kevin-Prince Boateng.
The Tottenham midfielder is currently on loan at Dortmund until the end of the season.
Boateng is currently on his way back from injury but he has impressed Dortmund during his stay.
But a reported fee of around £4.5million is one which the German club insists they will not be paying.
"We cannot pay that amount of money and we will definitely not pay it," general manager Michael Zorc told Westfalische Rundschau.
Dortmund are also yet to decide whether they want to make the deal permanent.