The veteran Swedish striker starred for United in the 2016-2017 season before suffering a knee injury that curtailed his time at the club.
After scoring 28 goals in all competitions, Ibra believes the English game is not as good as some say.
He said to FourFourTwo of his spell in the Premier League:"I'd had a long career before I came – different kinds of countries, different kinds of clubs.
"People said, 'You don't need to go to England, because if you fail in England, people will always say you weren't good enough'. Everybody was against it. And guess what? That made me motivated. That gave me adrenaline.
"I liked the Premier League. I found it very motivating and very exciting. It gets a lot of attention, although I feel the quality is a little bit overrated – the individual quality, the technical part.
"But the rhythm is high. Even if you are the best, if you can't handle the rhythm, the pace, then you will not succeed, because the pace is very high.
He added: "I'm super proud and super happy that I went to United – it was the right club.
"We won, and I did what I did before I got injured. I had an excellent time – great memories. I'm attached to United forever. The supporters are amazing: wherever I went, I saw red shirts, which was fantastic. It's a very important moment in my career.
"As I said when I was in England, you're lucky I didn't come 10 years ago, because if I did what I did at 35 years old, imagine it if I was 25. Then it would have been a different story.
"I came there and they said I came in a wheelchair. All the people that talked, in the whole Premier League, I put them in a wheelchair. That's what I did."
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