Deep into stoppage time now. This one looks to be heading for extra-time.

Millwall do make a few changes but young Zak Lovelace isn't among them. Sheyi Ojo is among those to come off.

Palace are preparing Luka Milivojevic too.

15-year-old striker Zak Lovelace is on the bench for Millwall. Would love to see him come on and have a go at Palace!

Bristol Rovers may fancy their chances of an upset against Championship strugglers Peterborough this afternoon.

The League Two side have travelled without manager Joey Barton who has tested positive for Covid-19.

Darren Ferguson's Peterborough are 22nd in the Championship and have just one win in their last five games.

Hartlepool were a non-league club last season but they're moments away from a memorable FA Cup win.

Graeme Lee's side have been superb. They could quite easily have folded after conceding early while Blackpool have wasted several clear cut chances.

Three minutes of additional time.

Derby are doing everything to try get this equaliser. The corner is bobbling about in the box before it does come to keeper Ryan Allsop. He can only head it over under pressure.

KEPPER UP FOR A CORNER.

New signing Kieran Trippier starts for Newcastle in their FA Cup tie against Cambridge.

Eddie Howe has made three changes from the draw with Manchester United on December 27.

Trippier, Matt Ritchie and Jacob Murphy replace Jamaal Lascelles, Javi Manquillo and Callum Wilson.

Newcastle XI: Dubravka; Ritchie, Schar, Krafth, Trippier; S. Longstaff, Shelvey, Joelinton; Murphy, Saint-Maximin, Fraser.

Subs: Gilliespie, Dummett, Hendrick, Manquillo, Almiron, Anderson, Willock, White

Image source, Getty Images

Cambridge make one change from Monday's draw with Portsmouth. Harvey Knibbs comes in for Sam Smith.

Cambridge XI: Mitov; Williams, Iredale, Digby, Brophy; Ironside, Dunk, Okedins; May, Knibbs, Worman.

Subs: O'Neill, Gill, Hoolahan, Lankester, Bennett, Yearn, McConnell

Ch ch ch changes...

So many the game hasn't found much of a flow in the past few minutes. Antoine Semenyo is on for Bristol City, Chris Martin makes way.

Time running out for Derby. Those four substitutions have injected some fresh energy but they've struggled to get any rhythm.

Coventry City try to kill a bit of time too. Jamie Allen and Matt Godden are off. They have played well today.

Non-league Kidderminster Harriers, the lowest ranked side left in the FA Cup, have one survivor of their last assignment on third round day eight years ago, striker Amari Morgan-Smith.

Harriers, fifth in National League North, have not lost in eight league games since losing at home to Brackley on 8 October.

Reading, 21st in the Championship, have won just twice in their 11 league games - but both of those were on their travels, at Birmingham and Swansea.

They have made eight changes from the side which shipped a 2-0 lead to be held 2-2 at home by Derby on Monday - but they include a former Premier League title winner in Danny Drinkwater.

It's League One promotion contenders versus Championship contenders this afternoon as Wigan take on Blackburn in a north west derby.

The Latics make three changes from their thumping 6-0 win over Oldham in midweek, with Jamie Jones Jason Kerr and Kell Watts all starting.

Meanwhile, Blackburn make five changes to their side with in-form Ben Brereton-Diaz starting.

Ryan Nyambe, Scott Wharton, Jacob Davenport and Hayden Carter are unavailable for the short trip to the DW Stadium.

Getting a bit open now. Millwall fans sense an opportunity to get at Palace. Sheyi Ojo kills the momentum though, with a wayward cross.

Is the first big shock of this season's third round coming in County Durham?

League Two Hartlepool are five minutes plus stoppages away from knocking out Championship side Blackpool.

Another change for Fulham. They throw Tom Cairney on in the hunt for a goal.

Four minutes of normal time left.

Premier League pair Leicester City and Watford make nine and seven changes respectively for the FA Cup meeting at the King Power.

The Foxes, decimated by injuries and availability issues with players off on international duty at the Africa Cup of Nations, hand a senior debut to Lewis Brunt.

They can only name seven players on the bench, with Jamie Vardy and Jonny Evans added to an injury list approaching double figures.

Watford are without injured top scorer Emmanuel Dennis and also have a number of players absent at AFCON, which means a senior debut for 20-year-old defender James Morris.

Leicester XI: Ward, Albrighton, Brunt, Vestergaard, Daley-Campbell, Perez, Tielemans, Choudhury, Maddison, Lookman, Barnes.

Subs: Schmeichel, Stolarczyk, Nelson, McAteer, Madivadua, Braybrooke, Alves.

Watford XI: Bachmann, Ngakia, Sierralta, Cathcart, Morris, Tufan, Cleverley, Sissoko, Hernandez, Joao Pedro, Fletcher.

Subs: Elliot, King, Sema, Kamara, Gosling, Kucka, Conteh, Forde, Agyakwa.

Jeffrey Schlupp catches Danny McNamara from behind and it kills the Millwall attack. He's already on a yellow so a few of the home fans think he should be getting a second.

The chances are falling to Bristol City, with Chris Martin's pull back fired over by Callum O'Dowda, who should have done better.

Jay Dasilva then shrugs off a tackle in the box but shoots straight at Paulo Gazzaniga.

Image source, Getty Images

What a cup tie!

Mansfield come from 0-2 down to level before Middlesbrough snatch it at the death.

Great drama.