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
Proposal would see a task force set up to assess environmental impact from breaches of emissions testing rules.
Hundreds remain missing in what is becoming one of the worst natural disasters to hit Central America in recent years.
Medical charity worker relates how he and colleagues tried to save patients and staff following devastating air strike.