Traore spent four years at Stamford Bridge after joining from Auxerre in 2013, however, he failed to break into the first team at Stamford Bridge.
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.