Sir Alex Ferguson has demanded the Football Association take action against Ashley Williams (pictured right) after claiming the Swansea defender "could have killed" Robin van Persie during the 1-1 draw at the Liberty Stadium.
Van Persie was struck in the back of the head from close range by a Williams clearance after being fouled by Nathan Dyer on the edge of the Swansea box in the 75th minute.
The Wales international did not appear to be trying to strike Van Persie, although the whistle had gone.
The Dutchman reacted angrily, sparking a melee which resulted in both players receiving a booking from referee Michael Oliver.
Ferguson: "The Van Persie situation you can clearly see that he could have been killed.
"The FA has got to look into it regardless that he has been given a yellow card. He should be banned for a long time because that was the most dangerous thing I've seen on a football field for many years.
"It was absolutely deliberate. The whistle has gone, the game has stopped and he has done that right in front of the referee, he could have killed the lad.
"It was a disgraceful act by the player, he should be banned for a long time.
"Robin van Persie is lucky to be alive. It was a disgraceful act from their player. He should be banned by the FA. Robin could have had a broken neck."
Swansea manager Michael Laudrup appeared bemused when informed of Ferguson's comments.
Michael Laudrup: "I did not see it at the time as there were a lot of players involved, but I saw it afterwards. I don't think he (Ferguson) meant literally killing him.
"Things happen in a game and I am sure Ashley and Van Persie shook hands at the final whistle and we move on."
Williams insisted he had not acted maliciously.
Ashley Williams: "I tried to clear the ball it hit him on the head. I was trying to clear the ball.
"He was obviously a bit angry about that. It was a much ado about nothing."