Former Manchester United captain Roy Keane was enraged after watching Manchester United fall to a 4-1 derby defeat against Manchester City.
United fell behind to Kevin De Bruyne's opener before Jadon Sancho levelled matters early on in the first half.
But Sancho's well taken equaliser was to be the last chink of hope for Ralf Rangnick's side on the day as City soon struck back, with De Bruyne easily dispatching his second goal of the game to nose City back in front before half-time.
And it got progressively worse after the break as Riyad Mahrez plundered two goals in a second half where Pep Guardiola's side could afford to relax and pass the ball around at will as United chased shadows.
The 4-1 defeat at the Etihad saw City complete a Premier League double over their rivals, having thumped them on a scoreline of 4-0 at Old Trafford earlier this season.
Keane was horrified at what he had seen and did not hold back in his analysis of the performance on Sky Sports.
He said: "We saw all of United’s shortcomings today. The way United lost the game today they stopped running.
"No running back, it’s really unacceptable when you play for Man United and I think they threw in the towel. They’re up against a top side but you have to tackle, you’ve got to run back, it was just a reflection of where the club is, they’re so far behind the other teams.
"We hear about problems with the new manager coming in but your own pride has to kick in at some stage. I was getting really frustrated, I can forgive mistakes but you have to put your body on the line.
"Wan-Bissaka, Fred, Maguire, Rashford came on, I could go on, gave up four goals and City didn’t have to be at their best at all. Shame on them.
"Once the third goal went in, the game was over. They threw the towel in, the white flag came up.
"We heard about the Ronaldo stuff before the game, that worries me, the idea that the manager is getting thrown under the bus again, doing interviews before the game and his hip flexor, there’s something going on in the background, there’s no hiding place. It’s a derby game, you’ve got to be switched on but De Bruyne’s got a tap in from seven yards inside five minutes.
"United do show moments but not enough of it. Sancho’s goal was a great finish but after that United didn’t do enough."
Keane also called into question the egos at play within Manchester United, and pondered whether club captain Harry Maguire is having internal struggles with the likes of Cristiano Ronaldo.
He continued: "I don’t know who’s running that dressing room. Look at Maguire, he had a poor game, is he having battles with Ronaldo, captaincy and all these things?
"Egos come into it, you leave egos at the front door, these guys are all about how am I looking? Are my boots nice? Is my hair looking good? Play the game.
"You’re at Man United, we’re looking at the fans behind the goal and they know, they’re not daft, this team we’re supporting have given up. We’ll hear a load of rubbish over the coming days, we’ve heard it before, there’ll be statements, ‘sorry about that, we’ll try it again next week’, it’s what you do on the pitch that interests me, not all the other garbage."
The former Republic of Ireland midfielder also pointed to the poor defending that invited City to extend their lead.
On City's go-ahead goal, he said: "Look at Fred, you’ve got a midfielder stood there like he’s waiting for a bus, your instinct has to go back towards your own goal and defend. Lindelof and Maguire sure, but Fred, he’s just stood there."
RIyad Mahrez hit City's third with a crisp half-volley directly from De Bruyne's corner, and Keane felt United allowed it to happen too easily.
He said: "United are too casual. When the ball is in the air, travelling, sprint out like your life depends on it.
"It’s like kids football there, rubbish, rubbish. You don’t see many goals like that because players usually sprint out and stop that sort of chance from happening."
And Keane tied up his analysis by suggesting that some within the United squad are not performing for interim boss Rangnick because he will not be in the hotseat beyond the summer.
He said: "I think he [Rangnick] always comes across honest, maybe tried to be too clever today but I think his hands are tied. He obviously knows his time is up in the summer and some of the players might be looking at him going ‘you’re only here until the summer.
"I don’t think they've improved, Rangnick is trying to work with big egos and he wants to play a certain way but the players don’t like it. You get a system that is trying to help United finish fourth."
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