Zlatan Ibrahimovic fires a powerful free-kick low but Jordan Pickford dives low to save and that is that.
- Kick-off: 15:00 GMT
- Injured Wayne Rooney misses match
- David Moyes returns to Old Trafford for first time since sacking
Benjamin Lewis: Why couldn't Zlatan Ibrahimovic have come to the premier league sooner? He is a sensational player who ages like fine wine.
Sophie Gayter: May have been offside but take a bow Mkhitaryan. Goal of the season so far.
Richard: Mkhitaryan with the best offside goal you'll see all season.
Ex-Man City & West Ham winger on Final Score
Mkhitaryan had no right to score from that situation.
Really he should just leave it and say it was a bad cross.
Somehow he has the ability and know-how to hit the back of the net.
BBC Sport at Old Trafford
What an amazing goal by Henrikh Mkhitaryan. A kind of first-time overhead back-flick whilst facing Sunderland's goal.
David Moyes is sat down now. So is Jose Mourinho, who has extended his unbeaten run to 11, which is the most Louis van Gaal managed as Manchester United manager.
Moyes managed 12.
Too late. But delightful. Fabio Borini with an inswinger into the top corner - picture perfect from the outside of the box, but it will do nothing to help his side in this match.Copyright: Reuters
Former Everton winger on Final Score
Paul Pogba has been simply sensational today. The timing of pass is great.
It was a magestic finish from Ibrahimovic. He just waits for Pickford to go ground.
United haven't been great today but across the season they have been very good.
Game over. What a finish by Henrikh Mkhitaryan, backheeling Zlatan Ibrahimovic's cross into the net, but the forward did seem a touch offside.Copyright: Getty Images
Senior football reporter
That was a gift - an absolute gift.
Cool as you'd like. A clinical finish from Zlatan.
That's his 17th goal of the season. He is level with Andy Cole in terms of his goal scoring ratio.
Cue the introduction of Marouane Fellaini for Ander Herrera.
Didier Ndong loses possession to Paul Pogba and the Frenchman sets up Zlatan Ibrahimovic, who finishes coolly into the bottom-right corner for his 17th goal of the season.Copyright: Reuters
BBC Sport at Old Trafford
Marcos Rojo has had his fair share of critics at Manchester United. And it is fair to say he has been fortunate not to be sent off recently for bad tackles against both Everton and Crystal Palace.
But the Argentine has not put a foot wrong this afternoon and has twice closed the door on promising Sunderland counter-attacks in the last few minutes.
Anthony Martial is introduced, replacing Juan Mata. Jose Mourinho will be hoping that the Frenchman's speed gives his team's attack added impetus.
Just as in the first half, Sunderland are fighting their way back into this match. Another corner for the Black Cats - hope - Seb Larsson pulls his corner back towards the D, but the change of ploy does not bring a change in fortunes.
George Hider: Since when is Djilobodji kicking Ibra's knee not a penalty? this is getting ridiculous. three pens we should have had this game
Yousuf Ali: How long before Sunderland receives an offer they can't turn down for Pickford?
Chinedu: All this cuteness will amount for nothing if Sunderland equalize
United completely dominant, enjoying over 60% of possession and so far in this match they've had a total of 19 shots, five of which have been on target.Copyright: Reuters
If the match carries on like this, it seems unlikely that Sunderland are going to get anything from this tie - but United need that second goal to ease the tension.
Khaihid De Bruyne: Pogba always seems to turn up against the smaller teams, when will he have an impact on the bigger games?
Mufc Believer: Game's screaming for Martial or Rashford upfront. Zlatan doesn't have to play every week.
Michael Devlin: The extra time off between matches has not been good for Ibra.
Victor Anichebe runs into a cul de sac but earns his team a corner, despite not receiving much support from his team-mates. Seb Larsson's corner drifts into the box, but it comes to nothing...
At the other end, Zlatan Ibrahimovic forces a save from Jordan Pickford. The Sunderland keeper rescues his team once again.
An immediate impact from Henrikh Mkhitaryan? Nearly. Juan Mata finds his team-mate on the left... beautiful control from the former Borussia Dortmund man and he's only a fraction wide of curling his shot into the bottom far corner.
United supporters are pleased to see Henrikh Mkhitaryan introduced. The play-maker replaces Jesse Lingard.Copyright: Reuters