Tom Yankello, the trainer for former four division world champion Roy Jones, cautions that a lot of the bookmakers are overlooking Mike Tyson's level of inactivity.
Tyson is the betting favorite for Saturday's eight round exhibition bout with Jones.
A former undisputed heavyweight champion, the 54-year-old Tyson retired from the sport in 2005.
But Jones, 51-years-old, fought for 13 more years beyond Tyson's retirement - with his last fight taking place in early 2018.
Yankello also brushes aside the claims that Tyson is a much bigger fighter than Jones.
He feels the two boxers are similar in size and might be similar in weight on the night of the fight.
Jones is going to weigh around 205-210-pounds when he enters the ring, while Tyson is reportedly around the same weight.
In the opinion of Yankello, a lot of fans are still viewing Tyson as the guy who blew away the competition 20-30 years ago - while overlooking the 15 years of inactivity.
He expects the inactivity to become a factor in the fight.
"Mike is a small heavyweight, it's not liked Roy is that outsized. He's a little bit taller, and the weight will be very similar from what I understand, I understand Mike is down as light as 210 even. Roy's going to probably come in around 205-210," Yankello said to Sun Sport.
"Mike's been fighting heavyweights his whole life, he's fighting a guy here with a more versatile skillset than anyone he has ever fought. And arguably against the greatest athlete to ever lace up gloves too. Mike stamped people's minds with what he did in the 80s and 90s and they kind of forget about how long he's been out the ring."