Derby improved their prospects of automatic promotion to the Premier League with a crucial 1-0 win over Championship promotion rivals QPR on Monday.
Steve McClaren's team moved within one point of second placed Burnley and third placed QPR thanks to a first half header from John Eustace at the iPro Stadium.
Eustace's goal was his first for Derby in more than four-and-a-half years and it was enough to extend fourth placed Derby's unbeaten run to five league matches.
The midfielder struck in the 20th minute when QPR goalkeeper Robert Green came to punch away Will Hughes' in-swinging corner.
However, the ball merely brushed his fist and was diverted towards Eustace, who returned it with a looping header into the far corner of the net.