The commission revealed they took into account the scrutiny Mourinho was under at the time with the result against Newcastle coming on the back of four matches without a win and intense speculation in the media the 55-year-old was on the verge of being sacked.
Mourinho was charged with improper conduct for remarks he made in his native Portuguese as he left the field at Old Trafford after the comeback win against Newcastle.
Jose Mourinho is still facing a touchline ban - after the FA launched an appeal against his unproven misconduct charge.
The written reasons explaining the commission's decision show that both Mourinho and the FA employed Portuguese language experts.
However, the Portuguese manager is expected to take his seat on the touchline for Sunday's derby with Premier League champions and leaders Manchester City as the appeal hearing will not take place before the worldwide break.
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The appeal hearing will not be until the global break, meaning that a ban could be in place for Crystal Palace's visit on 24 November. Xavier said that he believed Mourinho twice said "Vós sois uns filhos da puta", which Xavier said translates to "sons of a whore" in English.
"He has lost that slowly, even with the interruption of the season, since the start of the season he looks like he had a high level of energy that he has lost as well".
Valente said that "the victory was vindication" and he did not consider the words used in the context to be abusive, insulting or improper.
The FA brought in lip readers and linguistics experts to build a case against Mourinho, who in turn enlisted his own language experts to fight the charge.
JM [Mourinho] was clearly celebrating it, without aiming the words at anyone in particular. He also argued that his words were "entirely inaudible, were directed to no-one, were comprehensible only to a person possessed of sufficient lip reading skills and a deep expertise in Portuguese colloquialisms". We do not accept that he shouted the expression, as stated by Mr Xavier in his report.