QPR are set to appeal to the Football League after Derby rejected their ticket prices for this month's Championship clash at Loftus Road.
County claim prices of £30 for adults and £20 for concessions had been agreed over the summer for the game on September 27, but the London club sent tickets priced £10 higher.
A Derby spokesman said: "We think it is too high. We have stood our ground and QPR have exercised their right to appeal to the league."