Bertrand made only 16 senior appearances for the Blues before joining Lyon in the summer for £9m.
The Burkina Faso international has since impressed for Lyon, scoring four goals for the Ligue 1 giants so far.
“Going from Chelsea was the best decision for me. I am enjoying myself, as a young player you can only improve if you are playing every week,” Traore told the Daily Mail.
“I enjoyed my time at Chelsea and when I had opportunities to show what I could do on the pitch, I took them with both hands. But there weren’t any guarantee I would play.
“Yes, I would be happy if it was me in the Chelsea first-team playing every weekend, but this is football and you have to take decisions.
“Along with Chelsea, I took the decision to sign for Lyon and I am happy with that.
“It is up to me to develop and progress as a player and prove that I am good enough to play in the Premier League.”
And while The 22-year-old has no regrets over his decision to leave, he has refused to rule out the possibility of returning to Stamford Bridge in the future.
“Others went back, it is a possibility. I have to focus on Lyon, do my best and see what I do in the future,” Traore added.