Right then. Six hours of typing is starting to take its toll so time to rest my crooked fingers.
For League Cup final coverage head here and I'll see you later.
Arsenal goalkeeper Petr Cech: "It is a step back in the title race. We need to make sure we bounce back in the next game. It is a big week for us with Tottenham on Saturday and Swansea in midweek.
"We should have done better, we knew it would be difficult but we did not create enough to score more goals and made mistakes on the other side to concede three.
"We need to make sure every time Leicester and Tottenham slip we are ready to take the advantage."
It is almost time to wrap things up here, we'll have further reaction online later today but for now it is worth heading here to follow Tom Rostance's live text commentary on the League Cup final between Liverpool and Manchester City. You can also listen to commentary on BBC Radio 5 live.
Osama: Rashford and the kids deserves the accolades but the seniors have been immense in the past 72 hours cue Blind, Hererra, Memphis
Tunji Johnson: If you can't beat Bayern, Chelsea, Barca or Man UTD. You are never a top coach. Time 2 go Monsieur Wenger.
After Marcus Rashford scored twice, Louis van Gaal said he is not surprised that the club's young players are coming in and impressing.
"That is why we have a small selection because then you can give youngsters a chance. A big selection means they don't get a chance," he said.
"The experience of mine is youngsters always play well the first match. The second match is different. Marcus played well in both matches so he is a special talent."
Asked about memorable debuts, Van Gaal added: "I can imagine a lot of them. Patrick Kluivert makes the winning goal [for Ajax] in the Super Cup in the Netherlands. Xavi, fantastic against I think Valladolid [for Barcelona] and also Thomas Muller a fantastic debut. He was playing in the second team [for Bayern Munich]."
Chris Fleming: The title will go to the last day. United will do well to get 5th with their net spend of 200 million
Matthew Shaw: When will Leicester finally be considered the favourites for the title? The day they win it?
Manchester United boss Louis van Gaal, speaking to BBC Sport: "The performance and the result [was pleasing], when you are playing against one of the best Premier League teams and can play with such ambition and performance.
"We played very high in the first half, that is risky against a team like Arsenal but we changed things in the second half and were very compact."
Arsenal boss Arsene Wenger, speaking to BBC Sport: "We played with a lot of intensity, I cannot fault our commitment and spirit and desire but I feel we conceded too easy goals.
"I think after the game we have to be positive and prepare for the next one. We have another game on Wednesday, they come thick and fast and you want to keep a good mentality.
"We did fight until the end, we had a lot of the ball but I think we could avoid the goals with better concentration.
"I am disappointed because we lost the game but we will focus on the next one. This is a fight where you go to the next one and aim to come back even stronger."
Natala Natala, Arsenal fan: We're so naive! There goes our title hopes for another decade. We lost fairly, no complaints. @LCFC am behind U now.
Rob McConkey: Worst Arsenal performance since that 8-2. Utterly appalled. Feel sorry for all the fans
Hary: That was more like UTD under SAF. Looks like Rashford isn't a one game wonder and this is coming from a Chelsea fan.
I don't think I'll ever tire of finding different angles of Louis van Gaal's dive.
Is there enough time to get him nominated for a best-performance Oscar?
Jack Elliott: Who is Wenger going to blame for that defeat? Which player was tapped up before kick off?
Ashic Mahtab: People saying Rashford has shades of Welbeck are wrong. Latter looked a confused kid running at United. Rashford more clinical.
What does that result mean for the Premier League table?
Well, Arsenal remain five points adrift of league leaders Leicester while Manchester United are into fifth, just three points behind Manchester City in fourth.
Dave Jones: Anyone who thinks that #Arsenal team are going to win anything is delusional. Complete lack of commitment and desire.
Andrew Priestley: And that boys and girls is why Arsenal won't win the PL title. They had to be beating that young, inexperienced Man Utd side.
All over and a memorable Manchester United-Arsenal game.
A fist pump from Sir Alex Ferguson, who looks to be belting out a rendition of "glory, glory Man Utd".
A great day for the hosts, but disastrous for Arsenal. A hammer blow to their title hopes.
Guillermo Varela hammers a clearance from his box away before Ander Hererra is replaced by yet another debutant - midfielder James Weir, captain of the club's under-21 team, comes on.
Time is ticking away.
Crouch mode enabled for Arsene Wenger. Serious business now.
Adnan Januzaj is booked for a foul on Laurent Koscielny in the Arsenal half and every outfield Gunners' player charges up the pitch.
FIVE minutes of injury time for Manchester United to hold on, or for Arsenal to find a winner...
Juan Mata tries to keep the ball in the corner, Arsenal recover the ball but Timothy Fosu-Mensah wins it back and sends Adnan Januzaj away down the left. He passes to Mata, who pulls off an array of tricks and flicks, much to the delight of the home fans. They are getting a season's worth of entertainment bottled up into one half.
Jesse Lingard is down by the corner flag on the right after Mohamed Elneny stands on his foot.
From the free-kick Memphis Depay takes the ball into the corner, before winning a corner.
Never mind five goals and a headline-grabbing Premier League debut, this alone would have made this encounter memorable.
Most bizarre thing I've seen all season.
Arsene Wenger makes another change as Alex Iwobi replaces Danny Welbeck, who gets big applause from both Manchester United and Arsenal fans, with only a smattering of boos from the home end.
Scrap that, it appears a cloud gave David de Gea some respite from the sun. It is back and bright as ever as Arsenal build another attack.
Nervy times for Manchester United...
There will be no hat-trick heroics for Marcus Rashford as he is replaced by Adnan Januzaj. Deserved standing ovation after two goals and an assist. He won't forget this game.
Remember when Adnan Januzaj was flavour of the month?
It looks like he is about to come on, but Arsenal are pressing at the moment as Olivier Giroud heads over.
There is good news for Manchester United, though, as David de Gea is no longer being dazzled by the sun.
What. On. Earth...!?
A huge cheer erupts at the rare sight of Louis van Gaal getting out of his seat. Where is he going? The Manchester United boss walks up to fourth official and proceeds to lie down on the floor, presumably questioning the actions of someone on the pitch.
I've seen everything now.
Mohamed Elneny is on for Arsenal, having replaced Francis Coquelin a little earlier and his first involvement is to be booked for a hefty challenge.
How pumped must Leicester fans be? Both their league title rivals are slipping up at the moment, although Tottenham have just equalised against Swansea.
Tempers are flaring now as players rush in on Aaron Ramsey and Ander Herrea after a tussle between the two. Ramsey fouled Herrera, with the latter reacting angrily and the referee makes the right decision - booking them both.
And there's that commentator's curse again...
Arsenal are back in this as Danny Welbeck's shot is superbly blocked by David de Gea but there is nothing the keeper can do to keep out Mesut Ozil's volley on the follow up.
This is like a Manchester United-Arsenal clash of old.
Now Memphis Depay and Marcus Rashford play a one-two inside the Arsenal area but the Gunners block for a corner as Depay tries to dance his way through.
Arsenal are as poor as I have seen them for sometime.
Former England winger on BBC Radio 5 live
"Marcus Rashford is playing a blinder - two goals and now an assist. I think Gabriel might be wishing he hadn't made his comeback today."
First real chance of this half and Manchester United restore their two goal advantage.
It is Ander Herrera with the goal, his strike from outside the area getting a wicked deflection. Who made the assist? That man Marcus Rashford, who held up the ball well, looked up and picked out Herrera in space.
Poor defending again from Arsenal, Gabriel has had a shocker.
Blimey, I actually forgot Theo Walcott was playing in this game.
If he had a touch in this half I was not aware of it, and Arsene Wenger decides it is time to make a change, replacing the forward with Olivier Giroud.
Still the Manchester United goalmouth is bathed in dazzling sunshine, but hosts are on the attack through Memphis Depay, who has been giving Hector Bellerin plenty to think about throughout this game. He cracks a curled effort towards the near post, but Petr Cech is behind it all the way.