Third-round hero Kemar Roofe - who scored twice against Swansea - starts for Oxford, while Liam Sercombe is also in the side.

Blackburn are without striker Jordan Rhodes who is set to move to Middlesbrough, so Friday's loan sign Tony Watt starting up front. Defender Elliot Ward, who signed permanently from Bournemouth, also starts.

Oxford XI: Slocombe, Baldock, Skarz, Roofe, Mullins, Wright, Sercombe, MacDonald, O'Dowda, Lundstram, Bowery  

Blackburn XI: Steele, Marshall, Ward, Hanley, Spurr, Bennett, Lenihan, Evans, Conway, Jackson, Watt

Image source, Getty Images

Championship relegation battlers Bolton are unchanged from their 3-1 win against MK Dons last weekend.  

French midfielder Toumani Diagouraga, a recent signing from Brentford, makes his first Leeds United start.

Bolton XI: Amos, Vela, Dervite, Holding, Moxey, Trotter, Pratley, Davies, Feeney, Wellington, Madine.  

Leeds XI: Silvestri, Wootton, Bellusci, Bamba, Taylor, Cook, Bridcutt, Diagouraga, Dallas, Doukara, Antenucci.

Home and dry. Tottenham are surely safely through to round five after doubling their lead when Eric Dier's speculative effort deflects off a Colchester defender. Home keeper Jake Kean was left grasping at thin air.

Follow the final 25 minutes of that tie here.

Forest midfielder David Vaughan returns to the line-up following a three-match suspension. 

Watford make seven changes from the side that defeated Newcastle 2-1, with keeper Costel Pantilimon in for HeurelhoGomes and top scorer Odion Ighalo starting on the bench.

Forest XI: De Vries, Lichaj, Wilson, Hobbs, Cohen, O.Burke, Gardner, Vaughan, Grant, Ward, Blackstock.

Watford XI: Pantilimon, Nyom, Prödl, Cathcart, Ake, Watson, Guedioura, Abdi, Deeney, Anya, Amrabat. 

Image source, Getty Images

Last year's finalists Aston Villa field a strong team, although Brad Guzan comes in between the sticks in place of Mark Bunn. Carles Gil, Scott Sinclair and Jordan Ayew all start.

Villa XI: Guzan, Bacuna, Richards, Clark, Cissokho, Gana, Westwood, Veretout, Gil, Sinclair, Ayew

Manchester City striker Sergio Aguero drops to the bench so youngster Kelechi Iheanacho comes in. Willy Caballero starts in goal, while Bacary Sagna partners Nicolas Otamendi in defence.

City XI: Caballero, Zabaleta, Sagna, Otamendi, Clichy, Fernando, Navas, Fernandinho, Delph, Sterling, Iheanacho

Image source, PA

Will he leave before the transfer deadline? Not sure. But we do know that unsettled West Brom striker Saido Berahino starts for the home side.

Holders Arsenal make a host of changes - although Alexis Sanchez and Olivier Giroud both start. New signing Mohamed Elneny makes his debut in midfield. Full team news to come.

Had a flutter on the first goalscorer in your match? Time to see whether your man is starting or not. Let's hope they haven't been rested. Team news is filtering through...

Image source, Getty Images

Not content with just Mousa Dembele on their books, Tottenham are set to sign Moussa Dembele from Fulham. At least the double 's' in the latter's name will help differentiate the two men. Wonder if they will have to print their full names on their shirts? Or go for 'Demble I' and Dembele II'?

Anyway, it doesn't matter yet. Because Dembele junior, not related to his soon-to-be senior colleague, will be sent back to the Championship side on loan.

Tottenham's players are keen to put this tie to bed and head home. They're back out for the second half, a couple of minutes ahead of their opponents. Game on...

Want regular updates of that match? Then pop over to our dedicated page...

Chris Sutton
Former Chelsea & Norwich striker on BBC Radio 5 live

"Colchester going in at half-time only one goal down, their manager Kevin Keen will probably be quite happy and relieved. His side is still very much in the game." 

Image source, Getty Images

Get yourselves on the Balti Pies lads!

Queues are starting to form at burger vans, matchday programmes are flying out of cardboard boxes and sullen-looking headphone-wearing footballers are clambering down the steps of their luxury coaches.

Players and fans are starting to converge on football grounds up and down the country ahead of our 11 FA Cup fourth round ties.

Team news will start filtering through in about 15 minutes...

The half-time whistle finally pierces the chilly Essex air. Colchester can't use the six minutes of injury-time to peg back their lofty visitors, who lead through Nacer Chadli's clinical finish.

Missed it? Don't worry...

Football Focus
Portsmouth chairman Ian McInnes

"The Portsmouth Supporters' Trust was formed five or six years ago, essentially to improve on the way the club had been run, which wasn't very clever. Then a group of fellow fans with slighter bigger pockets joined in the battle, to win back this football club.

"The plan is to get promotion this year, we specifically chose Paul Cook as their manager because he has a good track record in this division and the one above, and the financial model we have will sustain us in both leagues. 

"Once you get to the Championship there is a bit of glass ceiling, I'd call it a double-glazed ceiling, because quite a few clubs have a few hundred million in their back pocket. But we plan to do it!"

Football Focus

Today's Football Focus came from Fratton Park - where League Two Portsmouth host Premier League side and local rivals Bournemouth later...