Mourinho will visit his former club for the first time on Sunday (4pm) when United travel to face the west London outfit.
Blues owner Abramovich sacked Mourinho last Christmas after a dismal start to the campaign.
The Portuguese tactician succeeded Louis van Gaal in May, but he has had a mixed start to the season.
And he has revealed he hasn’t spoken to the Russian billionaire after being given the axe as they were never particularly close.
When asked about his contact with Abramovich post-Chelsea, Mourinho told Sky Sports: “No. But we always kept that kind of relation. He was respected like that.
"I was the manager and I was respected like that. We were never close friends.
"If I go to his house, I go for professional reasons and for a professional meeting.
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Jose Mourinho doesn't have to wait long to lock horns with his former employers Chelsea
"If we see each other, it is only because of that, we would not share anything personal.
“We were not friends, maybe because I was respectful to the position of owner and maybe because his profile and relation to the manager.
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Jose Mourinho was never close to Roman Abramovich (pictured)
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Stamford Bridge will stage Sunday's showdown
"We did not have problems, but we were not close.
"When he made his decision that I was not the man for his club, it is the power that he has and I just have to accept that."
