Chris Foy played four additional minutes in the second half at Old Trafford. United were unable to take advantage as they slumped to a surprise loss, which ended Tottenham's 23-year wait for a win at Old Trafford and left Ferguson's side four points adrift of Barclays Premier League leaders Chelsea.
But the Scot was furious at what he believed was a lack of injury time, telling BBC Sport: "It is a flaw in the game that referees are responsible for time-keeping. It is nearly 2013 and the referee still has control of that."
He added: "They gave four minutes. It is an insult. It is ridiculous. It is denying you the proper chance to win the football match.
"There were six substitutions and the trainer came on. That is four minutes right away.
"The goalkeeper must have wasted two minutes. They took their time at every goal kick. That is obvious to everyone."
Source: PA
Source: PA