Sub Sanchez struck winner with late header
Man Utd had gone four matches without a win
Newcastle remain without a win all season
Magpies had led 2-0 at the break - increasing pressure on Mourinho
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Paul: I really wish they were filming an All or Nothing: Man Utd right now. That would be something to behold
Josh: anyone know if Rio Ferdinand is at Old Trafford? any chance we can get him to play at centre back for the second half?
Steve: I don't quite believe I am saying this, but I can still see Manchester United coming back and winning this. Could happen.
Man Utd 0-2 Newcastle
I don't think that either I, Simon Stone or Paul Pogba himself are really clear on where the Frenchman is meant to be playing.
A false six?
Image source, Getty ImagesMan Utd 0-2 Newcastle
Simon Stone
BBC Sport at Old Trafford
Manchester United are now onto their third different defensive formation.
It kind of looks like Paul Pogba is alternating between a third centre-half and a very deep central midfielder with Nemanja Matic and Chris Smalling definitely in defence.
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Don't worry, it'll be fine. Romero to come on for Lukaku.
Steve, Exeter
Man Utd 0-2 Newcastle
Paul Pogba and Nemanja Matic are playing in a back three.
WHAT IS GOING ON?
Man Utd 0-2 Newcastle
Away we go! Marouane Fellaini is playing forwards, with possibly Paul Pogba or Nemanja Matic at centre-back.
Man Utd 0-2 Newcastle
It's Scott McTominay who has come off at the break. Maroune Fellaini is on. Does that mean two midfielders are now ahead of Victor Lindelof in the queue to play at the back?
Man Utd 0-2 Newcastle
Speaking to BT Sport, former Man Utd midfielder Paul Scholes said: "I just feel sorry for everyone. You can often get a few players devoid of confidence but the full team looks like they are out of confidence and they are scared."
Man Utd 0-2 Newcastle
Right then, I'm not a betting man. Well not a successful one. But I still wouldn't back against Jose Mourinho's side coming back to win this.
Here come the sides...
SEND FOR FELLAINI
Eric could be home in time for Casualty if he makes a move now.
Man Utd 0-2 Newcastle
Speaking to BT sport, former Man Utd defender Rio Ferdinand said: "I don't see a way back for Eric Bailly at Manchester United and he has been made the fall guy this evening.
"They look like a team that is worried to make mistakes, and that is a concern."
Image source, PAMan Utd 0-2 Newcastle
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Not one for Mr Matic's scrap book.
Image source, MENManchester Evening News' half-time ratings of the United team are particularly brutal...
Image source, MENMan Utd 0-2 Newcastle
Image source, Getty ImagesManchester United have conceded seven goals at home in the PL this season. They only conceded nine at home in the PL last season.
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Shock, total shock.
Balogun: It's so glaring that Man United players are most definitely NOT playing to win; how pathetic. The only thing United on the pitch is Newcastle.
Ahmed: I know Jose is the main man to blame for the situation at United but it's not one man's fault here some players need to attend football 101! The club needs a complete overhaul!
Eghosa: I have been saying this for a long time now. The players are utterly disgraceful. We have no centre back. Lindelof is not even an option. We are not creative up front. Lukaku is not reliable.
John Bennett
BBC World Service
What would be the odds on the Man Utd job, the Bayern job and the Real Madrid job all becoming available before Christmas??
Man Utd 0-2 Newcastle
John Acres
BBC Radio 5 live commentator at Old Trafford
Boos ring around Old Trafford. Jose Mourinho has broken into a jog on the touchline and I wouldn't like to be in that dressing room. On the basis of what we have seen in that half, it doesn't look like they are going to get back into this one. It could be Mourinho's last team-talk in charge of United.
Man Utd 0-2 Newcastle
John Anderson
Former Newcastle defender on BBC Newcastle
Manchester United have been woeful, Newcastle have been great, we could be three or four up here. United don't look capable at all of getting back into this match.
They look void of ideas and void of confidence, it looks like Mourinho is doing everything in his power to get sacked!
Newcastle have been completely different to Leicester last week, they have been phenomenal.
Man Utd 0-2 Newcastle
Simon Stone
BBC Sport at Old Trafford
The boos that rang out on the half-time whistle were replaced by cheers as Mourinho headed to the tunnel.
United's supporters will back their team at the start of the second-half but they need something to cling on to.
Mourinho facing a massive 15 minutes.