Sinclair confronted his former Manchester City boss out of frustration at being left out in the cold.
He said: "He just didn't give me the chance. I asked him why he had brought me in and he couldn't answer the question.
"I said, 'You haven't given me an opportunity' and he just couldn't give me an answer.
"I never kicked up a fuss but it was just so frustrating. I don't regret the decision to go there but with hindsight I think I'd look at making the same one again."
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