The England international also received a £40,000 fine for climbing into the stand to confront an abusive fan after an FA Cup defeat to Norwich in March where Dier's brother became involved.
An independent panel ruled that Dier's behaviour was "objectively threatening" and it was not his sole intention to protect his brother.
Mourinho said: "My feeling is that in the majority of the cases, football is not protected by the people that are powerful and doesn't belong to this world.
Mourinho has been defensive of Dier from the off and said he would not agree if the club also decided to punish their player.
It has been revealed that any internal action was postponed until the end of the FA's disciplinary process, but the Portuguese's position has not changed.
"An internal action is an internal action that I don't think we need to share," he said. "I have no comments about it.
"You know, even without me answering direct to the questions, I think you know my position in relation to what happened. I would prefer to say in relation to what didn't happen."