"He's never been on the floor as an amateur or a pro, he won the junior world heavyweight championships, so he's the real deal and he's matured in his professional career."
Fury has also, apparently, suffered from blood poisoning as a result of serious acne, but is now over that and in top physical shape.
"All his wins have come while he had a debilitating illness," Warren said. "That's all gone now - he's had treatment, that's all cleared up and he's such a different guy now.
"You see him at ringside, he's solid. He hasn't got an ounce [of body fat] on him. He could fight tomorrow."
Warren also insists Team Fury won't be distracted by having to base themselves in Auckland for their preparation, although father and trainer Peter Fury's criminal record had threatened to derail his involvement. After two stints in prison for drug-related offences, Peter Fury was initially refused entry into New Zealand, but was granted a reprieve by associate immigration minister David Bennett last month.
"They're travellers," Warren said. "Travellers travel, don't they? They're travelling to New Zealand, that don't bother them. That's what travelling people do."