Former world champion David Haye believes Tyson Fury is taking a huge risk in changing his head trainer ahead of the biggest and most dangerous fight of his pro career.

When Fury decided to snap a layoff of over two years in late 2017, he hired Ben Davison as head trainer.

Last month, Fury stunned a lot of observers when he decided to replace Davison with Javan 'SugarHill' Steward. Davison had trained Fury for his last five fights.

Fury will challenge Deontay Wilder for his WBC heavyweight crown on Saturday night at the MGM Grand in Las Vegas.

The first contest, which saw Davison in Fury's corner, ended in a controversial draw in December 2018 at Staples Center in Los Angeles, California.

Haye is no stranger to changing trainers during his career, but he never made such a move a month prior to a major pay-per-view fight for a world title.

"The main factor in this fight is the teams," Haye said to BT Sport. "You're fighting someone who only needs to hit you once and it's over. You need to make sure that your defence is better and more airtight than it has ever been before.

"To trust that to someone who you've had no history with is a big, big gamble in the biggest fight of your career. If you're going into a situation where your life is on the line and you have one guy who has packed your parachutes 100 times in a row are you going to trust someone who you don't know... the answer is no.

"You wouldn't feel comfortable with that... the fact that Ben is not in his corner is the biggest factor in the fight."