The Hoops have averaged a point a game since Redknapp took charge immediately after their first meeting with United at Old Trafford in November.
Yet it is a measure of the perilous situation they were in before Redknapp was installed as Mark Hughes' successor that they remain four points adrift of Wigan at the bottom of the table - and more importantly seven behind Aston Villa, who sit just above the relegation zone.
Given the massive investment owner Tony Fernandes made, both getting Redknapp to Loftus Road and then bringing in even more players in the last year, it looks like a lavish outlay is about to backfire badly.
Ferguson realises he can make the problems even more acute this weekend.
However, he is convinced if anyone can drag Rangers out of the mire it is his old friend Redknapp.
"It is not easy when you are down at the bottom of the league," said Ferguson. "Harry will be the first to admit that.
"It may have helped him if he had gone a bit earlier. But with Harry's experience and ability to judge players, he will have a better chance that most in that situation."
- Sports & Recreation