Vidic caught Elmander by accident as they both challenged for the ball and the FA saw this and decided to take no action against the United player.
Ferguson was quick to defend his man.
“What is the old saying about people in glass houses?” he countered.
“When Nemanja Vidic came off at half-time he had a lump on his head the size of an egg, his cheek was swollen and he had a black eye.”
Sir added: “It was the best central defensive performance I have seen for years.
“I would have been amazed if the FA had charged him because clearly, his eyes were on the ball.
“There was no intent there whatsoever.
“I don't think he knew an opponent was there or who it was.”