The France international, who started in Les Bleus' 2-0 win over Ukraine on Friday, won a Premier League winner's medal in his first season in Manchester.
The 26-year-old started 28 of the 38 league fixtures as a key part in Roberto Mancini’s title-winning squad, and he believes that the move has improved him as a player.
"It's funny, but I am a vastly different player this year since I moved to City," Clichy told Sky Sports.
"In my head, it is a turning point in my career. I wanted to see where it could take me. I do not regret it for a moment, as I have gained in self-confidence.
"It has been 10 years that I have played in the Premier League, which is not bad.
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"I am champion of England and that is important in the life of a player, one feels stronger."
Clichy replaced Patrice Evra for Laurent Blanc’s France side for Friday’s win in Donetsk, but knows that there is no guarantee he will feature from the off against Sweden on Tuesday.
"You have to ask the coach [who he will pick]," he added. "All the better if several players can play in this position.
"If each of us plays in that role and we reach the final, we will all be happy I think.
"The coach has maybe his starting XI in his head but he knows that the others can make a difference."