Johnson bagged his first goal for City in the 1-1 draw against his hometown club on Sunday afternoon but he had mixed feelings because he had scored against the side he supported as a boy.
"If there was one place I probably wouldn't have wanted to score my first goal, it would probably have been here," explained Johnson.
"But I am just thankful I have finally got off the mark because I am a Manchester City player now.
"But that's how it goes, isn't it? That's football."