The Scot was sacked less than a season into a six-year contract after succeeding Sir Alex Ferguson as Moyes took the defending champions to a seventh place finish and out of Europe.
“I’ve said all along I was unfairly treated there. When you sign a six-year contract and you end up with 10 months … yeah, I believe I was,” he told English newspapers.
“I didn’t win enough football matches but you must say there were mitigating circumstances. And I think you could say there are maybe things which have gone on since then that would actually justify that even more so.”
Moyes refused suggestions that he was out of his depth at Old Trafford, and said his experience with United only reaffirmed to him that he can be a top manager.
“What my time at Manchester United gave me is an unbelievable idea of what it is at the top. I believe that’s where I can work and that’s where I should be working, and my level is that.
“You don’t get offered the Real Madrid job, the Barcelona job, the Manchester United job, if you’ve not had something to suggest there’s a reason for it,” he said.
“I don’t think I have anything to prove to anybody else, but I am always proving to myself that I want to keep my standards high.
“I think I’ve got the fourth best win record in the Premier League out of all the managers. If I can even bring a bit of that to Sunderland, that will make a difference.”
Do you agree with David Moyes? Was he not given enough time to succeed by Manchester United?