Derby County were languishing down in 21st place in the Championship in October but they have turned it around under Steve McClaren. In fact they are up to seventh now and could be in the play-offs by the end of the season. 

Goals and highlights from this weekend's FA Cup fourth-round games will be available on the BBC Sport website from 17:15 GMT on Saturday.

BBC One is showing three live cup ties, starting with Derby v Leicester now.

Millwall host Watford two days later at 12:00, followed at 16:00 by holders Manchester United against Wigan.

Highlights programmes will run on both Saturday and Sunday, with the latter including Sutton's home tie with Leeds.

BBC One

All set? Get BBC One on or watch at the top of the screen...

Gary Lineker explains how you can get involved in the FA People's Cup - the five-a-side tournament that could take you to Wembley.

It's free to enter for teams and individuals and there are 16 categories for age, gender and ability.

For more information on how to sign up now, check out our Get Inspired guide.

How do you see this game going then? Radio 1 DJ Adele Roberts and 1Xtra’s A.Dot are taking on Lawro in his FA Cup predictions and this is their verdict    

A.Dot: The FA Cup is all about upsets, and this is going to be the upset of this round. Derby are at home and in decent form in the Championship and Leicester are in awful form, especially away from home, making one of the worst title defences in history.

Adele: I am probably going to go the other way. It is a huge East Midlands derby - they are not friends! - and I just feel the Foxes are going to pull it out, because they need to win something this season and I think they are going to throw everything at the FA Cup and try to win it.

A.Dot: Leicester have lost their last two matches 3-0. Psychologically, they are going to be down in the dumps. 2-1

Adele: But you cannot count out Foxes striker Jamie Vardy, you just can't. This is the FA Cup and it will mean everything to their players. I feel like Leicester are going to do it. 1-2

Dan Walker takes you behind the scenes at Derby. Get involved...

Image source, Getty Images

Darren Bent has scored in nine of his last 10 FA Cup games, including all four for Derby (9 goals).

It turns out that Darren Bent collecting trainers is actually very normal...

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

I don't think Leicester can't afford to take liberties with any competition the way they have been playing. They need to go strong. It would have been very disappointing if Steve McClaren had rested players for Derby. It is brilliant that he hasn't. I don't think there will be much between them.

Robbie is in the BBC One studio tonight, alongside Alan Shearer and Gary Lineker. Lineker has just compared Robbie's haircut to a certain Mr. President.

You can judge for yourselves at 19:30 GMT. 

Marron: Starting the weekend with the Robbie Savage derby!!  

Southampton fans have celebrated their team reaching the EFL Cup final by painting the city's post boxes in the club's famous stripes.

Two red post boxes have been given white stripes to match the Saints' colours since Wednesday's semi-final win over Liverpool at Anfield.

Image source, Getty Images

We can't condone this, obviously, but it got me thinking:

How would you celebrate your team winning the FA Cup?

Image source, Getty Images

Let us know on text (81111) or Twitter (#bbcfacup). Keep it legal. If you want. 

Marvellous. 

Image source, Getty Images

Has your team overcome adversity to make it through to the next round of the FA Cup? Or won in the dying seconds?

We're looking for people who are passionate about the game to send us a short video that tells the story of the FA Cup from the fans' perspective.

It could be Steven Gerrard's never-say-die approach in the 2006 final, Ben Watson's last-minute winner for Wigan in 2013 or simply your away-day journeys around the country.

It's up to you.

All we ask is that it's no longer than 20 seconds in duration and explains what your story is and why you should be chosen to collaborate with the BBC and other online football personalities on our No Guts, No Glory campaign.

To enter simply email a link to your video or send a file to facup@bbc.co.uk and include your name and the club you support in the title, along with a contact number in the body of the email.

Alternatively, you can share your video with us on social media using #nogutsnoglory.

Here's one from Radio 1 Extra's A.Dot to get you started...

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

Derby have been playing very well. Leicester can't find a rhythm. They can't replicate what served them so well last season.

I mean, once you got to 500 pairs, you might start to think about stopping. Right?

Derby County's Darren Bent talks about his obsession with trainers and reveals he owns over a thousand pairs.

READ MORE: Derby County assistant boss seeks inspiration from Leicester

Riyad Mahrez is on Leicester's bench after returning from the Africa Cup of Nations following Algeria's early exit.

The Foxes make three changes from the team which lost 3-0 to Southampton in the Premier League, with Marc Albrighton, Andy King and Ben Chilwell coming into the team.

Derby only make one alteration from the starting line-up which beat Reading 3-2 in their last game. Bradley Johnson plays in the place of Julien de Sart. Darren Bent starts up front.

Leicester: Schmeichel, Simpson, Morgan, Huth, Fuchs, Albrighton, Drinkwater, King, Chilwell, Okazaki, Vardy. Subs: Zieler, Musa, Gray, Mendy, Ndidi, Mahrez, Benalouane

Derby: Carson, Baird, Keogh, Pearce, Olsson, Johnson, Bryson, Hughes, Ince, Russell, Bent. Subs: Mitchell, Christie, Shackell, De Sart, Butterfield, Camara, Vydra.

No away wins in the Premier League but the Foxes pulled off an FA Cup win at Everton in round three. 

And another strong side. Derby make just one change as former Norwich, Leeds and Northampton man Bradley Johnson comes in for Julien de Sart. 

John Bennett
BBC World Service

Tonight I face my toughest task since arriving at the Africa Cup of Nations - finding somewhere that will show Derby v Leicester City.