Full-time: Derby County 1-3 Manchester United
- Led by Antony Martial, Manchester United book their place in round five of the FA Cup with a deserved victory over Championship promotion contenders at the iPro Stadium
- Wayne Rooney opened the scoring with an excellent curled effort, but George Thorne equalised before half-time
- Visitors largely dominated again after the break and secured victory with further goals from Daley Blind and Juan Mata
- Win eases some of the pressure on Louis van Gaal, who denied that he offered to resign following the 1-0 loss to Southampton last weekend
- Derby are without a win in their last four matches
A comfortable evening's work for Manchester United in the end and that victory will begin to ease some of the pressure that has built upon Van Gaal over recent weeks. If they had lost at the iPro Stadium tonight, then it would have been impossible to see anything other than an early exit for the Dutchman.
That is all from us for now, but stay tuned to IBTimes UK for post-match reaction later tonight. We will also be back tomorrow to keep you fully up to date with a bumper FA Cup Saturday, including live coverage of Colchester vs Tottenham and Arsenal vs Burnley in addition to West Ham's trip to Liverpool.
Until then, have a pleasant evening.
Derby 1-3 Manchester United
Inventive play from Hendrick in the penalty area and the ball nearly sits up nicely for him but United can clear. The visitors are in complete control as the final seconds wind down.
Three minutes of added time to be played at the iPro Stadium. Surely United are safely through to round five now.
Martial has been a constant thorn in Christie's side tonight, but there were more hints of offside as he collected the ball for that third goal. Again, it was very tight.
Game, set and match United. After being relentlessly hassled by Mata near the right-hand byline, Christie finally gets the ball clear. It comes straight back, however, and the Derby defender is left on his haunches by another trademark run from Martial, who tees up Mata to finish from close range.
That is the Spaniard's first goal in 15 games. No coming back from this now for Derby.
Goal: Derby 1-3 Manchester United (Juan Mata)
A moment of concern for Van Gaal as Smalling stays down after a good clearance to prevent Martin claiming a cross from Ince. The England defender is now back on his feet.
Some very strong and skillful running on display from Martial again tonight, even if his final ball has been occasionally lacking. Rooney looks to test Carson with a lob from distance but he is penalised for a blatant shove on Keogh.
Van Gaal utilises his bench with 15 minutes left to play as Carrick returns from injury in place of Schneiderlin.
Derby respond by sending on Johnny Russell and Jeff Hendrick. Johnson and Thorne are the men to make way.
Impressive anticipation from Varela to spot the danger and get in ahead of Camara to head Ince's cross behind.
Camara then produces a ball of his own for Jacob Butterfield, but the former Huddersfield midfielder gets his finish all wrong and the ball goes well wide.
A Derby corner creates havoc in the United penalty area. Although Martin cannot turn the ball goalbound, there are loud appeals for a penalty as Keogh falls rather theatrically under a high foot from Morgan Schneiderlin.
Replays show that the French midfielder looked to be withdrawing his boot at the time, although there was certainly some holding from Smalling on Jason Shackell.
65 minutes on the clock and United retake the lead. After Blind comes forward from defence and feeds Mata, he stays in the final third and drifts unmarked into the penalty area before dispatching Lingard's low cross into the bottom corner.
Goal: Derby 1-2 Manchester United (Daley Blind)
Derby breathe a sigh of relief as a sustained United attack produces three quickfire chances. Still 1-1 but the visitors are really piling on the pressure now.
Clement makes the first change of the night as Blackman is replaced by fellow January signing Abdoul Camara.
Agonisingly close to a second goal for United as Rooney plays in Lingard, whose cross skips up off Warnock before being headed a fraction wide of the post by Mata.
Martial takes on Christie once more before providing a low ball towards Rooney that the England veteran pokes towards goal only to be denied by a good block from Keogh.
The first yellow card of the evening is awarded to Warnock for a heavy sliding challenge on Varela. No complaints from the Derby captain.
Martin occupies the attentions of Blind and releases Christie down Derby's right flank. The Republic of Ireland international charges forward and delivers a quite brilliant cross over the head of Smalling that Ince is inches away from making contact with.
Blackman collects the loose ball and looks to beat Varela before firing a shot over with his weaker right foot.
Pressure from Derby now as Blackman forces a corner from Varela. Smalling deflects the ball behind for another in quick succession but the referee blows for a foul by Johnson on Blind.
A quick start from Martial as he evades his marker before supplying a dangerous cross that misses Rooney and goes out of play for a throw. Electric stuff from the 20-year-old.
No changes from either Clement or Van Gaal at the break.