The 25-year-old winger completed a big-money move to
Johnson could have signed for the Black Cats back during the 2010 winter transfer window with then manager
Johnson said: "I had the choice of going to
"Looking back, I would probably do it again – I suppose any young lad would in my situation then.
"But it's worked out now that I am here."
He was far from guaranteed a place in Mancini's starting line-up and with the Italian indicating that the situation was unlikely to improve, he decided to cut his losses.
Johnson admits he will look back on his time at City with mixed feelings, but his spell with the club will also include some big highlights.
He said: "You can always look back and think. It was a slightly disappointing end, but I won the Premier League, FA Cup and the Community Shield and played in the Champions League, so it wasn't all bad.
"But it was a little bit disappointing I didn't play as much as I was capable of.
I owed it to myself to go and play football again and enjoy playing."
Johnson made his debut for his new club in its 2-0 Capital Cup win over League Two Morecambe earlier this week, in which he set up
A return to the Socceroos becomes less likely with every passing squad announcement, but still coach Holger Osieck says there is hope for Harry Kewell.