United are in the unusual position of having kept clean sheets in their last five consecutive league games, and have only conceded two goals in eight Premier League matches - both away from home.
But while the defensive solidity has become a matter of pride, it is in scoring goals that United have fallen short of their previous standards.
Ferguson said: "What's happening at the moment is unusual for us, every team is waiting for a deluge.
"It will happen, we will score goals, unfortunately it has not come as quick as I would like but we are playing well enough, creating the chances and it will happen.
"It's great, we get criticised for winning 1-0... if we win 5-1 people will say our defence is going to pieces.
"The team are coming together after a shaky start in terms of winning games. There is now genuine evidence of (Wayne) Rooney, (Cristiano) Ronaldo and (Carlos) Tevez starting to do well and Nani's performance on Tuesday was very encouraging.
"Defensively, it's the best record we have had in that [opening] period of games.
"The players know if we are defending well it gives us an absolutely marvellous chance of getting some silverware.
"It's now a matter of certain pride to the defenders to maintain their record."