Phil McNulty
BBC Sport chief football writer at Etihad Stadium

Jose Mourinho may not forgive Marouane Fellaini if Manchester United lose this. They have had their backs to the wall for the entire half and the Belgian gets himself sent off for an act of crass stupidity.

Long last few minutes for Mourinho's men now.

There were 19 seconds between Marouane Fellaini's yellow card and his red card - which was a straight red by the way. And in between those he also clipped Sergio Aguero.

This game has really kicked off now. Gabriel Jesus comes in very late with a tackle on Marcus Rashford and he gets booked. And both players clash again.

Charlie Adam
Stoke City midfielder on BBC Radio 5 live

He totally lost his head. This is what a derby can do to you. 

Danny Mills
Ex-England defender on BBC Radio 5 live

It's not a Glasgow kiss but it was a definite headbutt and yes, of course it's a sending off. 

Absolute stupidity. 

Yes, Aguero made an awful lot of it but it was a definite move forwards from Fellaini. 

Chris Waddle
Ex-Spurs and England winger for 5 live Sport

Silly man. 

What is he thinking? He just had a yellow card and then he does that? 

Jose Mourinho has to make a defensive switch and Timothy Fosu-Mensah replaces Henrikh Mkhitaryan.

City boss Pep Guardiola can see a chance to win the game here and Gabriel Jesus makes his return from injury, replacing Raheem Sterling.  

Marouane Fellaini had to be almost dragged off by his team-mates. What on earth was he thinking? The world's stupidest man. Can United hold on?

Just seen a replay and Marouane Fellaini stuck the head onto Sergio Aguero. A deserved red card. It was a football headbutt rather than a Glasgow city centre on a Saturday night headbutt. But you just can't do that. 

He totally lost his head, pun intended.

Wow, literally seconds later, Marouane Fellaini is sent off for clashing with Sergio Aguero. Chaos.

Image source, Reuters

With seven minutes to go, we've had the first yellow card. Marouane Fellaini catches Sergio Aguero from behind.

When I was watching El Clasico on Sunday, I would have loved another hour of football added on. 

Now I quite fancy the world's first 82-minute game.

AdamClowes: Zlatan limped off with an ACL tear...Bravo tweaks his calf and off on a stretcher as if he's snapped his leg in 3 places. 

United make a change now - Jesse Lingard coming on for Anthony Martial out wide.

Lingard must be one of the oldest youngsters in the country at 24. 

AADZ: How can you damage your calf throwing the ball? 

KN: Great. The one weakness City has is going off. 

OBAREKI: So the "O" in Bravo counts finally; a clean sheet! 

Manchester City bring on Willy Caballero in goal for Claudio Bravo, who can't play on after catching that cross. The Chilean leaves on a stretcher with what seems to be a calf strain. It's not been his year.

And Jesus Navas comes on for Leroy Sane on the wing. Experience for youth.

Image source, Reuters

Compliment or comment on the game?

A J @soundloud: Even though this game is broadcasting free on national sports tv here in Russia, I prefer reading the live text. Alex

This almost sums up Claudio Bravo's season. He's actually injured himself while catching that corner. He's getting treatment.

Marcus Rashford's corner is caught by Claudio Bravo under pressure. The City fans celebrate it like he's saved a penalty.

Ander Herrera's cross hits Pablo Zabaleta. And United have a corner. A big moment.