The Football Association has received Sir Alex Ferguson's observations about his post-match comments at Tottenham last Sunday.
Ferguson submitted the information prior to the 6pm deadline, the FA confirmed. Now the FA has until Tuesday evening to decide whether to formally charge Ferguson.
Ferguson spoke out following the 1-1 draw at White Hart Lane, when United conceded an injury-time equaliser after Wayne Rooney's penalty claim was rejected by referee Chris Foy.
However, it was assistant Simon Beck who bore the brunt of Ferguson's ire, with the Scot's discontent with the linesman dating back to April 2010 when he failed to spot Didier Drogba was in an offside position as he scored a crucial goal for Chelsea at Old Trafford.
"He had a really poor game," said Ferguson at the weekend.
"There was no way the linesman was going to give that - he gave them everything.
"It was a clear decision. And he was 10 yards away, maybe 12 yards away from the incident and he doesn't give it. And yet he gave everything else.
"I am disappointed with him [Beck] - we have not had a good record with him.
"With Chelsea a couple of years back, he gave onside to Didier Drogba and he was three yards offside. You remember these things because it is in important games and that was an important game."