FULL-TIME: Manchester United 1-0 Manchester City
United narrowly defeat City and probably deserve the win based on their second half display. After a tight first half, the home side had the better chances in the second 45 minutes and were just about worthy of the win.
Four minutes of added time
There will be four minutes of added time, can City find an equalizer or will United hold firm?
81 min: Rashford off, Lingard on
United make their final change of the evening as Rashford is replaced by Lingard.
79 min: Maffeo makes brilliant challenge
Manchester City youngster Pablo Maffeo makes a brilliant challenge to prevent a United opportunity.
Mata off, Schneiderlin on
Jose Mourinho brings off his goalscorer and hands a rare appearance to Morgan Schneiderlin.
70 min: Nolito off, Aguero on
Manchester City make their final change of the evening as Sergio Aguero enters the field in place of Nolito.
62 min: Sane off, Sterling on
In an attempt to get back into the game, Guardiola brings on Raheem Sterling in place of Leroy Sane.
Mata opens the scoring for United
Ibrahimovic crosses for the Spaniard who sweeps the ball home for the Red Devils.
GOAL: Manchester United 1-0 Manchester City (Mata, 54 mins)
49 min: Great save by Caballero
Paul Pogba has an attempt at goal but Caballero pulls off a brilliant save, tipping the ball onto the post.
Second half underway - Kompany is replaced by Kolarov
Manchester United kick-off the second half and City also make a change. Captain Vincent Kompany leaves the field and is replaced by Aleksandar Kolarov.
HALF-TIME: Manchester United 0-0 Manchester City
It's not been a great half of football as both teams go in level and goalless at half-time. Let's hope for a better second 45 minutes. Elsewhere, West Ham are beating Chelsea 1-0 and Southampton are drawing 0-0 with Sunderland.
38 min: Pogba's ball is cut out by Caballero
Paul Pogba puts a dangerous ball into the box but Caballero palms it away.
36 min: Rashford's shot is blocked
Ibrahimovic plays a good pass to the England striker who cuts inside from the left, but Maffeo blocks the youngster's shot.
26 min: Yellow card for Valencia
Antonio Valencia goes into the referees book for a challenge on Fernando
25 min: Chances few and far between
This Manchester derby hasn't quite lived up to expectations so far and Iheanacho's early header has been by far the best and only real chance of the game.
13 min: Yellow card for Iheanacho
The Nigerian is extremely unlucky as he slips and brings down Blind then goes into the referee's book.
1 min: Iheanacho heads over
It's a bright start from Man City as Navas beats Shaw on the right and finds the head of Iheanacho. The Nigerian's close range header goes well over the bar. Should have done better.
Match underway
Nolito gets proceedings underway for Manchester City.
Mourinho names strong side, Guardiola rings the changes
Jose Mourinho has named a strong starting XI, despite making four changes. Marcos Rojo and Luke Shaw come into the back four as Bailly misses out through injury and there is no place in the squad for Chris Smalling. Carrick and Mata come into the midfield in place of Fellaini and Lingard.
Meanwhile Guardiola gives rare run-outs to Spanish youngsters Pablo Maffeo and Aleix Garcia. Big names such as Gundogan, Sterling, Aguero, Fernandinho and Kolarov are all on the bench.
Official line-ups announced
Manchester United: De Gea, Valencia, Marcos Rojo, Blind, Shaw, Carrick, Ander Herrera, Mata, Pogba, Rashford, Ibrahimovic.
Subs: Romero, Darmian, Fellaini, Schneiderlin, Lingard, Memphis, Young.
Manchester City: Caballero, Maffeo, Otamendi, Kompany, Clichy, Fernando, Garcia, Nolito, Navas, Sane, Iheanacho.
Subs: Gunn, Gundogan, Sterling, Aguero, Adarabioyo, Fernandinho, Kolarov.
Follow all of the action with live updates of the EFL round four tie between Manchester United and Manchester City here.