McDermott was angered by Fury's taunts before their first fight, but they now share a mutual respect after two titanic struggles.
The Essex man, who also has links to the travelling community, admits he will be cheering on Fury in his grudge match with Haye.
"Of course I would, why not?", he said.
"That's boxing for you. He slagged me off the first time, then you have such a fight with someone, you have respect for them.
"I have spoken to Tyson since, we have met up, we've sparred together, we've been out to dinner so I think he's a nice bloke.
"I'd like to see him win, of course I would."