"Dunnie's inspirational. I've played with John Terry and Rio Ferdinand and I think he's easily on a par with those two, that's how highly I rate him," he told City's website.
"I did play at centre back with him for a while in my first season, so I know what his strengths and weaknesses are and we work quite well together."
Micah also praised Kasper Schmeichel, in goal for the Blues' fine start to the season, who only made his full debut at Upton Park on the opening day of the season.
"Three games, three clean sheets. A lot of people were saying that he should not be playing because he wasn't experienced but he's not conceded a goal yet! It's not been that easy, and we have Arsenal next week so let's not get too excited just yet.
"While we are in this vein of form we have to keep it going as long as possible, and there's no reason why we can't."