MANCHESTER UNITED boss Sir Alex Ferguson claimed Sunday’s humiliating derby defeat was the “worst result in my history”.

The Scot looked on as arch rivals and league leaders Manchester City thrashed 10-man Reds 6-1 on their own patch.

The romp saw the Old Trafford side suffer their heaviest derby defeat in 85 years – one that Fergie couldn’t comprehend.

He said: “I’m shattered, I can’t believe it. It was our worst ever day. It’s the worst in my history, ever. Even as a player I don’t think I ever lost 6-1. That’s a challenge for me too.

“I can’t believe the scoreline. The first goal was a blow for sure but it was retrievable at 1-0. The sending-off was a killer for us.

“We kept attacking when we went 4-1 down and we should have just said, ‘We’ve had our day’.”

Controversial City star Mario Balotelli, who had a “Why Always Me?” T-shirt under his strip, grabbed a double and Jonny Evans clocked a straight red before Sergio Aguero slid in the third.

Darren Fletcher pulled one back but Blues sub Edin Dzeko added a double with David Silva also on target.

Ferguson added: “We just kept attacking.

“It was crazy football. I thought with the experience we’ve got – Rio Ferdinand, Patrice Evra -they would have defended more but we just kept attacking.

“Sometimes there has to be common sense about it. It was a bad day.”

But the Scot has labelled the rout the “perfect result” to fire up United’s season.

He added: “We’ll come back. By January we’ll be okay. We usually get the show on the road in the second half of the season and that will have to be the case.

“We will react, no question. It’s a perfect result for us to react to as there is a lot of embarrassment in the dressing room.”