"I remember when I was a young player at CSKA Sofia and the good life was all I was interested in. Celtic came in for me and I moved to Glasgow, to another country, to a new world. I didn’t speak the language and I thought it would never happen for me. I knew nobody.
Fortunately, I met people who helped me to turn my life around. I came to know great teammates who showed me the proper way, the way I had to be if I was going to be a serious professional and compete at a high level.
I came to appreciate so much the opportunity to work with that level of professional people because it made me something like them.
At Celtic Football Club and at Aston Villa Football Club I was privileged to live a life competing at a high level and playing the game I love, supported by the most passionate fans."
More top news
Indian superstar Salman Khan was found guilty of killing a homeless man after a night out drinking.
A student whose weight plummeted to just under five stone as she battled anorexia is hoping her recovery will help others.
A jury has retired to consider its verdict on a man accused of murdering his wife by steering their pick-up truck off a motorway.