Postpublished at 90+4 mins
Man Utd 1-1 Arsenal
Wayne Rooney is booked for an extended, album version of a rant to referee Andre Marriner.
Giroud powers in late header as Arsenal grab a draw
Mata slides in Herrera's cross for the opener
Mourinho furious as Utd denied penalty
Monreal brought down Valencia in the box but no penalty given
Mourinho never lost PL game to Wenger
Tom Rostance
Man Utd 1-1 Arsenal
Wayne Rooney is booked for an extended, album version of a rant to referee Andre Marriner.
Man Utd 1-1 Arsenal
John Murray
BBC Radio 5 live commentator at Old Trafford
That penalty shout from the first half might get a mention from Jose Mourinho now...
Minute 35...
Man Utd 1-1 Arsenal
Granit Xhaka is booked for a trip on the right and Manchester United have a chance to load up the box. Instead they pull it back to Ander Herrera, his chip into the middle is easy for Petr Cech to catch.
Man Utd 1-1 Arsenal
Do Arsenal deserve a point? Almost certainly not. Does that header deserve a point? Absolutely yes.
Superb from Olivier Giroud. He took three men out of the game without disturbing a single hair on his head.
Man Utd 1-1 Arsenal
Mark Lawrenson
Former Liverpool defender on BBC Radio 5 live
What a substitution from Arsene Wenger now. Great ball and great header from Giroud after he had a running jump at it.
Man Utd 1-1 Arsenal
John Murray
BBC Radio 5 live commentator at Old Trafford
Oxlade-Chamberlain with an excellent cross and then Olivier Giroud has just boshed it in. Great header and Arsenal are level.
Oxlade-Chamberlain did to Rashford what we normally see Rashford do to defenders.
Olivier Giroud
One effort, one goal! A goal totally out of character for Arsenal, but absolutely unstoppable.
It's a beautiful sight, if you like this sort of thing. And I do. Sub Alex Oxlade-Chamberlain takes on his man - Marcus Rashford - and whips in a great cross but Olivier Giroud has so much to do.
He climbs and jumps over three defenders to meet it on the full with a smashing header. Duncan Ferguson-esque.
Man Utd 1-0 Arsenal
Mark Lawrenson
Former Liverpool defender on BBC Radio 5 live
Arsenal have been pretty solid in defence today but offered nothing in attack. It's just been sidewards, sidewards, backwards and repeat.
John Murray: This is going to provoke all the old questions about Arsenal.
Man Utd 1-0 Arsenal
Mark Lawrenson
Former Liverpool defender on BBC Radio 5 live
To think that Jose Mourinho sold Juan Mata at Chelsea. Listen to the applause he's getting at Old Trafford.
Man Utd 1-0 Arsenal
Juan Mata - who was booked for having the temerity of celebrating his goal with some fans - goes off to a huge ovation. Morgan Schneiderlin is on.
Man Utd 1-0 Arsenal
Come on Arsenal, at least have a shot! This has been a very laboured, tired looking performance. Dire in fact.
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Man Utd 1-0 Arsenal
Mark Lawrenson
Former Liverpool defender on BBC Radio 5 live
That Rojo header was not unlike Sanchez's effort in the first half and it probably ended up as wide of the goal as Sanchez's did too.
Let's just have a quick rummage in the inbox. Ah yes, there we go...
Same old Arsenal. Fall apart in November, lose to a poor Man Utd squad. Wenger out is the only solution.
Chris in Herts
Another year but the same old story for Arsenal at Old Trafford.
Dan. From Malvern.
Another big game, another failure. Typical Arsenal, typical Wenger.
Anonymous
Man Utd 1-0 Arsenal
The man with the hammer left foot, Granit Xhaka, is on for Arsenal in place of Francis Coquelin. It might take a 30-yard screamer for Arsenal to get back into this one. They haven't looked like creating much else.
Man Utd 1-0 Arsenal
Good play, again, from Antonio Valencia as he digs out a testing cross but it can't quite find a man in red. It then comes in from the left, Daley Blind whips it in, Marcos Rojo meets it with a commanding header but his radar is askew. Wide!
Man Utd 1-0 Arsenal
Mark Lawrenson
Former Liverpool defender on BBC Radio 5 live
Arsenal just don't seem to be pushing on at all. You'd rather lose 2-0 going for the draw, wouldn't you?
Man Utd 1-0 Arsenal
It's been limp and lifeless from Arsenal, it really has. Not a single effort on target yet. There are 13 minutes left.
Crystal Palace v Man City (15:00 GMT)
Manchester City
Some genuinely surprising team news in as Yaya Toure starts for Manchester City.
Man Utd 1-0 Arsenal
John Murray
BBC Radio 5 live commentator at Old Trafford
We've seen little to nothing of Arsenal as an attacking threat in this half. Or in the match as a whole for that matter.