Roberto Mancini’s side ran riot at Old Trafford, dominating the game and punishing poor defending from the home team.
When asked to reflect on the nature of the defeat and the scoreline, the Scottish coach admitted that it was a disastrous result.
“It was our worst ever day,” Ferguson told Sky Sports.
“It’s the worst result in my history, ever. Even as a player I don’t think I ever lost 6-1. That’s a challenge for me too.”
The Premier League champions continued to attack in the second half after Jonny Evans had been sent off, and Ferguson feels his side relinquished their defensive responsibilities.
“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.’
“I thought with the experience we had with Rio Ferdinand and Patrice Evra we would have realised that. But we just kept attacking. We were so open. Sometimes there has to be common sense about it,” he stated.
The Premier League can expect a reaction from the Old Trafford outfit, and Ferguson finished by stating that his players will be motivated to forget the heavy defeat.
“That’s a perfect result for us to react to.
“There’s a lot of embarrassment in the dressing room today. They’re all disappointed in there, that will make a difference,” he concluded.
United now find themselves five points behind their cross-town rivals in the Premier League standings, and will look to move on and get three points against Everton at Goodison Park next weekend.
By Gareth McKnight