Ferguson was furious with the decision to allow Newcastle's second goal in the hosts' 4-3 win at Old Trafford.
But Dean made no reference to the incident in his match report, and on that basis the Football Association - who were still awaiting the report yesterday - has no cause to take the matter any further. The FA would only have a remit to do so in such a case if the referee drew their attention to the incident.
Dean has described in detail the sequence of events to referee chief Mike Riley, explaining why there is no chronicling of Ferguson's behaviour in his official account, which is then submitted to the FA.
Dean has told Riley, the general manager of the Professional Game Match Officials (PGMO), that Ferguson held a "reasonable and rational" conversation with him, expressing discontent at the decision to allow the controversial own-goal by Jonny Evans.
Riley was informed the United manager did not use foul or abusive language, nor did Dean feel his integrity was questioned during their conversation - the crux as to why no further scrutiny will be necessary.
This version of events will undoubtedly raise the eyebrows of those who have seen the TV images and photographs of the encounter, but the referee has suggested the pictures of their discussion make it look much worse than it actually was.
Dean has said it was merely a difference of opinion expressed between official and manager.
The controversy began when Dean overruled his assistant referee, Jake Collin, to allow Newcastle United's second goal. Although centre-half Evans scored an own-goal, Papiss Cisse appeared to be in an offside position as the ball flew past David de Gea. Collin initially signalled for offside, but following a consultation, Dean ruled that Cisse was not interfering with play and the goal stood. An enraged Ferguson approached Dean as he made his way out for the second half, before rounding on Collin and the fourth official, Neil Swarbrick.
There was an expectation this conduct would be referred to the authorities but, on a matter of technicality, it now appears it was inevitable Ferguson's actions would not be mentioned in the post-match report because he was not disciplined at the time.
Dean had the authority to send Ferguson to the stands if he felt he had crossed a disciplinary line.
The fact he did not meant it was difficult for Dean to make any observation about indiscipline later, as he would have been asked why, if he thought it was worth bringing to the FA's attention, he had not deemed it necessary to act while he was still on the field of play.
Ferguson will therefore have no case to answer, despite the furore over the manner in which he approached the official and his assistants.
After suggestions the United manager has mellowed in recent seasons, it has been like a trip down memory line over the festive period.
His admonishing of the officials on Boxing Day swiftly followed the bizarre comments by Ferguson last weekend when he claimed Swansea's Ashley Williams could have "killed" Robin van Persie by kicking a football against his head.
He had called for Williams to be banned, but there was no FA action against the Welsh captain.
Meanwhile, Borussia Dortmund striker Robert Lewandowski appears to be edging closer to a move to Old Trafford, with claims in Germany a summer transfer is already agreed.
United will have to pay 18 million pounds for the Polish striker, a long-term target of Ferguson. The United manager has extensively scouted Lewandowski - including when Dortmund played Manchester City in this year's Champions League. He would have moved for the striker last summer had his bid for Van Persie failed.
There are suggestions the 24 year-old has already agreed a five-year contract at Old Trafford worth around 4 million pounds a year.
Ferguson has also allowed Bebe to leave Old Trafford on loan. He has joined Portuguese side Rio Ave. Bebe moved to United in 2010 for pounds 7.4 million pounds, one of the least impressive purchases of the Ferguson era.
He has scored twice since and was sent on loan to Besiktas last season. Since then he has suffered a cruciate knee injury, but has recovered and is hoping for a fresh start in Portugal.