Last Updated: 05/01/14 4:11pm
It's all over and Chelsea have booked an FA Cup fourth-round clash with Stoke thanks to this hard-fought 2-0 victory over Derby. Second-half goals from Mikel and Oscar proved enough to see off the plucky Sky Bet Championship outfit, who can take plenty of positives from this clash as they turn their focus on a promotion push. Stay with us for a full report and reaction.
Chelsea have no intention of conceding at this late stage as Cole does well to head a cross behind for a Derby corner, which is subsequently cleared.
Derby fans want a free kick when Hughes goes down under pressure from Luiz but the referee waves play on.
Bennett comes close to pulling a goal back as his low drive from the edge of the box goes narrowly wide.
The Derby fans sense a new lease of life from their side as a few hopeful crosses get sent into the box.
Connor Sammon's reverse pass down the left side of the area falls into the path of Martin, who sees his powerful shot saved at the near post by Schwarzer.
A Derby goal would at least make the closing stages of this clash interesting but there's no sign of this coming at the moment as a long ball over the top is headed back by Cole into the arms of Schwarzer.
Chelsea have clearly picked up the pace again and Ramires comes agonisingly close when his shot hits the top of the bar.
Moments later the Spaniard has a chance to redeem himself but his low shot from a tight angle down the right side of the area is well saved by Grant.
Fernando Torres skips inside the box and then rounds Grant but somehow loses control of the ball and allows the Derby defence to get back and prevent him slotting into an empty net.
Chelsea have a throw down the right wing which they are in no hurry to take as they look to wind down for the final part of this match.
Chelsea may well have just taken their foot off the gas having grabbed that second goal which has surely killed off any Derby hope of earning a replay.
Nevertheless the Sky Bet Championship club can be proud of their efforts this afternoon having restricted Chelsea to just two shots on target so far.
Derby are beginning to look very tired after all their gutsy defensive exertions so far and they may struggle to keep the score down if Chelsea continue to press forward.
GOAL OSCAR - This tie could well be over now as Oscar's ferocious strike from the right side of the box is too powerful for Grant, who can only parry into the net.
Willian's first delivery into the box is headed behind and his second attempted is cleared in the other direction to safety.
It's hard to see Derby coming back from this having struggled to trouble Chelsea so far but at the moment they have more defending to do as the visitors win a corner.
That was Chelsea's first attempt on target - but they will certainly hope to create more chances in an attempt to put this tie to bed.
GOAL MIKEL - Chelsea finally make the breakthrough as a free kick from Willian on the left wing picks out Mikel, who firmly plants his header into the goal.
Ramires' fierce shot from just outside the box cannons against Martin as Derby continue to thwart Chelsea.
Chelsea will be hoping the introduction of Fernando Torres at the expense of Eto'o could inject some new life into their play.
Derby have battled so hard to frustrate Chelsea so far today but they've been unable to offer much from an attacking point of view.
One too many passes from Chelsea in their latest attack as Cole fails to get his cross from the left into the box following another promising move.
Willian hoists the free kick into the box and although Cahill wins the first header, Derby's defenders hack the ball clear.
Hughes is shown the yellow card after a late challenge on Oscar, who gingerly gets back to his feet.
Wisdom powers down the right wing and earns his side a corner after Mikel tracks back to make a sliding challenge.
Derby are able to get their breath back after sustained Chelsea pressure after Dawkins is fouled in their own half.
Chelsea will need Hazard to provide the creative spark the rest of their players have failed to supply if they're to avoid an unwanted replay.
The Brazilian star seems to have made a swift recovery although Chelsea are preparing a substitution with Eden Hazard warming up.
Derby win a free kick on the right edge of the box after Will Hughes is brought to ground by John Obi Mikel.
Chelsea stay on the front foot although Willian's looped cross from the left is headed away by Craig Forsyth.
Essien threads a lovely pass into the box for Oscar, whose low pass across the face of goal is cleared before Eto'o can get on the end of it.
Sky Bet have several half-time price boosts to take advantage of, including 12/1 on Derby to win 1-0, 16/1 on Chelsea to win 3-0, 8/1 on Oscar to score next and 20/1 on Jamie Ward in the same market. It's 66/1 that Chris Martin scores next in a 1-1 draw while Samuel Eto'o to score next in a 2-1 Chelsea win is 40/1. In terms of the match betting, Derby are now 11/2, Chelsea 4/6 and the draw 15/8. Head now to www.skybet.com to place your in-running bets.
The half-time whistle sounds as Derby and Chelsea head into the break still level at 0-0. Join us shortly for the second-half of this FA Cup third-round clash.
Moments before the break, Ramires cuts inside on the right edge of the box before seeing his low shot hit the outside of the post following a slight deflection off Jeff Hendrick. The resulting corner is then comfortably cleared.
Willian's cross from the left side of the box is too high for the leaping Essien to get on the end of so Derby survive again.
Michael Keane gets himself in a good position at the near post to clear Derby's lines after Cesar Azpilicueta sends a dangerous low cross into the box from the right.
Derby earn a corner, which they play short before the subsequent cross is deflected behind by Oscar for another.
Oscar, seeing a number of Derby bodies between himself and the goal, opts to shoot rather than thread a pass forward but Grant isn't required to make a save as the ball sails over.
Same old story for Chelsea - they once again get close to the Derby box but an attempted ball into the box is cleared.
Derby try to get forward down the right wing but Ward's cross is blocked and Chelsea regain possession.
Essien helps on Eto'o's cross from the right but once again Derby clear after packing the area with bodies.
Chelsea are largely being restricted to shots from distance and this time Oscar's sizzling drive curls wide of the post.
Chelsea's passing and moving continues to be quick and urgent but there still lacks a killer cutting edge at the crucial moments.
Oscar takes the resulting free kick and although his curling effort leaves Grant beaten, the ball whistles just wide of the post.
Derby goalkeeper Lee Grant is relieved to watch Ramires' powerful shot from long range go wide of the mark.
Back at the other end of the field, Ward gets away from David Luiz but his shot from just inside the area is blocked by Gary Cahill.
Willian tries to skip through the Derby midfield but is unable to get past the battling Eustace, who forces him out wide.
Derby are back on the front foot, with Ward's cross on the right taking a slight deflection into the arms of Schwarzer.
Essien also wants to try his luck from distance but ends up dragging his effort well wide of the mark.
John Obi Mikel sets himself up for a shot just outside the box but there's too many bodies in the way and he has to turn back.
Eto'o is put clean through on goal but he takes too long inside the box and allows Wisdom to catch up and force him off the ball. The Blues striker really should have done better then.
It's all Derby at the moment in terms of possession although neither side have managed to create any clear-cut chances yet.
Simon Dawkins' optimistic volley from the left edge of the box flies high over the bar for a goal kick.
The home crowd are really up for this clash and the atmosphere they're creating is helping to give their side a genuine lift.
Derby are passing the ball around well in midfield and now it's Chelsea struggling to break out of their own half.
The hosts are beginning to grow in confidence and continue to apply forward pressure. This time John Eustace blasts a volley from distance only to see it blocked inside the box.
Ward takes aim from distance but slices a low shot well wide of the target. He feels it took a deflection but the referee Andre Marriner points only for a goal kick.
Derby launch their first meaningful attack of the match as a dangerous cross from the left towards Ward is just about cut out by Ashley Cole.
Derby have seen little of the ball and are therefore struggling to showcase just why they are one of the best sides to watch in the Sky Bet Championship.
Chelsea fans will be encouraged to see their side make such a positive start with plenty of intent to get forward early on.
Chelsea attack down the right with Ramires but his low cross into the box is cleared by the resilient Derby defence.
Chelsea are dominating possession at the moment, with their fans already cheering every successful pass the team string together.
Michael Essien drives through midfield before slipping it out wide to Oscar, whose cross towards Eto'o is put behind for a corner.
A lovely move forward through midfield from Chelsea ends when Samuel Eto'o overhits a pass down the right wing for Ramires, who can't reach the ball before it goes out of play.
Jamie Ward attacks down the right before whipping in a dangerous cross but Chris Martin's header loops into the air for Mark Schwarzer to take a routine catch.
Chelsea have never lost a third-round game since the turn of the Millennium - in fact their last defeat at this stage of the season came against Manchester United back in January 1998.
Earlier today West Ham were made to pay for making so many changes to their side as they were thrashed 5-0 at Nottingham Forest although it's more than fair to say that Chelsea's alterations hardly weakens their chances given the wealth of talent in the squad.
Both sets of players make their way onto the pitch ahead of this FA Cup third-round clash at the iPro Stadium so kick-off is just moments away.
The FA Cup fourth-round draw has just taken place and the winner of this tie will face Stoke at home.
Simon from Peterborough writes: "A few changes today with a few of these needing to prove a point, though I would of like to see Jose play Mata to see if he would get a reaction from being subbed so early last week. See this a 3-1 to Chelsea but this is the FA Cup! Best of luck to both teams."
Azeem Meeza writes: "What a great match for both manager, morinho trying to make up for the capital one defeat to Sunderland and McClaren wanting to carry on with his impressive form at the club. Nevertheless I will predict Chelsea to win 4-1." And Iain Hughes says: "Good game install all but I reckon 5-0 chelsea maybe more!"
Elliot Black writes: "I think Derby will make it hard for Chelsea today, especially with the way they've been playing in the Championship. But I think the depth in the Chelsea squad, especially in attacking positions, will see Chelsea claim a hard-fought win."
As you can see from the team sheets below, Jose Mourinho has made six changes to his Chelsea side at the iPro Stadium. Mark Schwarzer, David Luiz, Michael Essien, Oscar, Willian and Samuel Eto'o all come in following the 3-0 Premier League win at Southampton, with Petr Cech, John Terry, Juan Mata, Eden Hazard, Andre Schurrle and Fernando Torres replaced. Steve McClaren's Derby, who have lost just two of the former England manager's 15 games in charge, make two enforced changes following the Sky Bet Championship loss to Wigan, with striker Johnny Russell (fractured cheekbone) and midfielder Craig Bryson (leg) absent and Jeff Hendrick and Simon Dawkins replacing them. Today's referee is Andre Marriner.
Derby: Grant, Wisdom, Keane, Buxton, Forsyth, Hughes, Eustace, Hendrick, Ward, Martin, Simon Dawkins. Subs: Freeman, Sammon, Bennett, Legzdins, Whitbread, Bailey, Cisse.
Chelsea: Chelsea: Schwarzer, Azpilicueta, Cahill, Luiz, Cole, Essien, Mikel, Ramires, Oscar, Willian, Eto'o. Subs: Cech, Torres, Mata, Hazard, Terry, Kalas, Baker.
Hamish Oliver writes in to say: "Really tense in my house because my dad grew up in derby and supports them while I have supported Chelsea for all my life as we live in London!"
If you fancy a flutter on today's clash then where better to head than www.skybet.com, who have a number of price boosts to take advantage of. They have pushed out the price on Chelsea to win 2-0 to 7/1 from 13/2 while those who fancy Derby to edge it 2-1 can now get 25/1 rather than the previous offering of 20/1. Oscar to score the first goal is now 8/1 from 7/1 and Derby's Jamie Ward is now available at 12/1 in the same market from 10/1. Sky Bet have also boosted the price on Willian to score first in a 1-0 or 3-0 win for Chelsea to 22/1 while Ramires to net the opener in a 2-1 or 3-1 victory for the visitors is now 33/1. In terms of the match prices, Derby are 13/2 to pull off a cup shock, with Chelsea the clear favourites at 2/5. A draw can be backed at 4/1. So head now to Sky Bet to place your pre-match and in-running bets.