The 33-year-old also paid tribute to his family and supporters on a visit to the West Midland club's Bodymoor Heath Training Ground. The club's captain was diagnosed with the disease in March last year and has undergone intensive bouts of chemotherapy treatment.
A year later and he is now in remission and is positive about "getting back to my life" and said: "It was a very, very long year but now, after all this treatment, I can go back to a normal life.
"At the start I thought it was just a cold, nothing serious but just something normal."
He added: "I have finished all of the high intensity treatment and from now on I'll be on the softer treatment, which is two years on tablets.
"I can start doing things that I couldn't do in the last year. I can take the kids to school, I can come here (to the training ground), I can start doing a bit of work and losing a little bit of weight.
"It's been a long year for me and the support from all the fans, from the club, from the players, has been amazing. I've been saying that every time I have had the chance to say a few words but I'm glad that this hard year is behind me now and I can concentrate on getting back to my life."
Petrov admitted he did not know much about the treatment for the disease before it started but he now realises he has made an amazing recovery.
He said: "I didn't know how long it would go on for, what would happen and things like that.
"While the treatment was going on I was surprised how long things were dragging on, it kept dragging and I kept thinking: 'When is this going to finish?' but with a lot of patience and a lot of support from family and friends and everybody I managed to pull through.
"I had my hard moments but I had good moments as well. I can say I'm lucky because some people with this disease will die very quickly and I managed to keep battling and still be here, still standing. It's really good, that's a great thing."