United made it 22 points from the last 24 on offer with a 3-1 victory at White Hart Lane on Sunday, their toughest fixture on paper until their April 30 showdown with City.
Sir Alex Ferguson's men appear to have the easier build-up to what could well be a title decider at the Etihad Stadium but defender Ferdinand was taking nothing for granted.
"All we have ever said is to keep putting points on the board," he said.
"Our last two away games have shown the professionalism in the camp and that has been fantastic. We have to continue that.
"We have big games coming up. Each game will be like a cup final. I know that's a cliche but it's true."