Derby's Championship showdown at home to east midlands rivals Nottingham Forest this weekend is a sell-out.
The remaining tickets for the clash at Pride Park at Saturday lunchtime were snapped up shortly before 4pm on Monday, meaning the stadium will be packed out with 33,000 fans from both ends of the A52.
Rams chief executive Sam Rush told the club's official website: "Although I've only been with the club for two weeks, I am very aware that when the fixture list was revealed in June this was one of the first games - if not the first game - for which everyone connected with Derby County looked out for.
"I am sure Pride Park will be rocking on Saturday and the prospect of having a full house is extremely exciting. The game can't come soon enough now."