Boyhood Magpies fan thrilled with strike...
Johnson, 23, was born in Sunderland but grew up supporting their near-neighbours. He even signed for the club as a youngster before he was released at 12 and made his name at Middlesbrough.
Speaking to the Blues' official website, the England international revealed his joy at his 75th minute goal in the 2-1 victory.
He said: "I wasn't a Sunderland fan, I was at Newcastle and supported them as a kid.
"It's extra special to score against my old team but I play for City now, so that's all that counts."
He added: "It's one of the best goals I've scored.
"It's my first in the league here and it's nice that it was the winner.
"It's always the plan when you're a sub to come on and try to make a difference.
"I did that. If we're going to do well this season, we need to grind out results."