Alex Oxlade-Chamberlain has had a cracking game and he's quick enough to beat his man again and stand up a cross. Alexis Sanchez attacks it, he gets there ahead of Antonio Valencia but his header is well held by David De Gea. Plenty of power, but not enough direction in the header.

Image source, AP

Chris Bevan
BBC Sport at Emirates Stadium

"It is the Manchester United supporters making all the noise now, and it will be interesting to see how the Arsenal fans respond to this setback - they have understandably been deflated since that bizarre goal went in. That was United's first real attack of what had been a completely one-sided second half, yet the Gunners are behind."

Simon, York: You can't give Valencia time and space to line up his trademark vicious shot cross. No one in the world does it better than Antonio in my opinion.

James, Oxford: Now shall we talk about the defences?

Simon in Windsor: Wow what a joke saw it coming the whole game same old story dominate the game don't score then concede a shocking goal how much longer can this be allowed to go on.

Can Arsenal respond. Everyone appears a bit shell-shocked by the nature of that goal. It had not been on the cards at all, Arsenal well on top since the break. But one ball in, Kieran Gibbs had a meltdown and now United lead. Send for Olivier Giroud?

Wil:, external Cracking finish by Gibbs that.

Paul Seaton:, external If ever a goal summed up a game, THAT was it. Utter calamity from start to finish.

Ajay Patel:, external When everything is going against you, sometimes you need a little bit of luck.Valencia can't cross for his life,but he's scored.

Image source, Reuters

Wojciech Szczesny is keen to carry on but the matter is taken out of his hands - he's off and Emiliano Martinez is on in nets.

Image source, Empics

It looks like Wojciech Szczesny will have to come off too. A disastrous 10 seconds for Arsenal. Manchester United lead without having a shot on target.

A calamitous goal! Kieran Gibbs makes two errors, first of all he collides with Wojciech Szczesny as the goalkeeper punches away a cross. He is then sitting on the floor when Antonio Valencia flashes in a cross/shot from the right, but reacts in time to snake out a left foot and divert the ball into the far corner.

An own goal, and he's injured the keeper...

Jack Wilshere comes back on but he can't run, he can't even walk to be honest. He sits down and that's that, time to come off. He is replaced by Santi Cazorla.

Image source, PA

Manchester City midfielder Yaya Toure:, external Great to score winner today!! Thank you for your fantastic support City fans - I really appreciate it!! #ComeOnCity!

It has been a fantastic week. Helping my country to AFCON and now scoring the winner for City!! #Happy

Jack Wilshere is on his feet, but his left ankle was severely twisted on impact, a horrible looking bend. Will he be OK? We shall see. He's off for some treatment now.

Danny Welbeck should have done better there - and now Jack Wilshere is in real trouble. He is clattered by Paddy McNair as he released the ball, right at the base of the ankle.

A heavy tackle, he really caught Wilshere. Lots of concerned faces from his team-mates.

Image source, Getty Images

Impressive start form Arsenal. Per Mertesacker makes a mug of Marouane Fellaini, beating him twice at a corner to reach the ball first, but his half-volley is wild and over the top.

Alex Oxlade-Chamberlain then frees Danny Welbeck over the top - but David De Gea makes another big save!

Aetesam from London: It is pretty worrying when you look at the amount of goals Wilshere has scored for us. Yeah he's been injured a lot but with his ability it just doesn't make sense, his finishing is just appalling at times and is costing us here again.

Mike in Derbyshire: Mike Dean has bottled a simple decision of a red card. He had a clear view of Wilshere putting his head into Fellaini's face, it had to be red?

Balding of Highbury: Re Roy the DUFC fan, the 'average armchair fan' has only recently been given the voice to make daft comments via social media. Many fans have talked nonsense for years, myself included at times of frustration......C'mon Arsenal, break the habit of the last 10 years and stop wasting chances!

Good pressing from Arsenal straight from kick-off, winning the ball back high up the pitch. High tempo, high intensity, that is when Arsenal were at their best in the first half.

No changes at the break. Arsenal get us back up and running.

Olivier Giroud to come on and win it? The Arsenal forward is back on the bench this evening.

Image source, Getty Images

Steve Huish, Surbiton: If there's no pressure on LVG how come there was pressure on DM ? Surely he should of been given the same time frame as LVG has had.

Rob, Southampton: Why are people having a go at united defence - we haven't conceded. Surely questions need to be asked of midfield on front of them?

Andy, Manchester: As bad as the defence have been they've been getting no help from the midfield. Second to every ball has allowed arsenal to dictate the play and left the back 3 exposed. Only came back into it when our midfield got a grip.

Jermaine Jenas
Former England midfielder on BBC Radio 5 live

"Arsene Wenger is going to be remembered as one of the greatest managers that has graced the Premier League.

"He brought a whole new culture to Premier League - the way we eat, the way we rest and the way players and teams are supposed to be prepared."

Keke:, external Arsenal's mistakes are just gonna end up with glorification of De Gea and undeserving mockery of Wenger.

Lewis Tizard:, external Wilshere is switching on my town's Christmas lights tomorrow, hope he makes the evening as eventful as his performance so far!

Luis McClelland:, external Tyler Blackett is awful. Ox has been all over him, press more in the midfield and we've got this. Come on Arsenal!