Ricky Hatton said he was "back to fight for world titles" as he announced his return to boxing.
Hatton, who would often put on weight between fights and checked into a rehabilitation centre in London in 2010 after being photographed apparently snorting cocaine, said:
He said: "It's well documented what's happened to me, my life turned to mush. I feel I've put a bit back into the game but it didn't fill the void. I got my trainer's licence and started working in the ring and that started the fires burning and I started looking after myself a bit better.
"I'm back to fight for world titles. It's more than a comeback. It's worth more than money. A lot of people have said they don't want me to tarnish the legacy but they don't know what goes on between my ears."
More top news
An orangutan who has lived in a zoo for the past 20 years, can be granted basic human rights, a court in Argentina has ruled.
Socialite Tara Palmer-Tomkinson has been cautioned by police after a 'disturbance' at Heathrow Airport.
The NHS is to set up 11 centres to unlock the secrets of DNA and help develop tests and drugs to target cancer and rare genetic diseases.