Darren Barker says Daniel Dubois has "freakish" confidence before his bout with Joseph Parker, while Sergio Mora adds the Briton has "shed that reputation as a quitter."
The star will defend his IBF heavyweight title against the former WBO champion this Saturday at Riyadh Season's The Last Crescendo, live on DAZN Pay-Per-View.
Heading into February 22, the Briton has been riding high after a rich run of form, including a brutal fifth-round stoppage against Anthony Joshua in September.
Former IBF middleweight title holder Barker believes that has helped his self-belief further blossom, but noted Parker himself will also be no pushover either.
"What a fight, what a fight," he said on DAZN's coverage of Tuesday's Grand Arrivals. "These are two of the in-form heavyweights. Their confidence has been elevated.
"The confidence that is coming from Dubois is freakish, if I'm honest. That win against AJ has just taken him to another level.
"It's mad to think Parker is only 33, but what he has is lots of top-level experience. It is a very interesting fight [between the two]."
| Fight | KSA | GMT | ET | PT |
| Artur Beterbiev vs Dmitry Bivol 2 | 2:00am | 11:00pm | 6:00pm | 3:00pm |
| Daniel Dubois vs Joseph Parker | 12:40am | 9:40pm | 4:40pm | 1:40pm |
| Shakur Stevenson vs Floyd Schofield | 11:35pm | 8:35pm | 3:35pm | 12:35am |
| Carlos Adames vs Hamzah Sheeraz | 10:35pm | 7:35pm | 2:35pm | 11:35am |
| Vergil Ortiz Jr vs Israil Madrimov | 9:40pm | 6:40pm | 1:40pm | 10:40am |
| Zhilei Zhang vs Agit Kabayel | 8:40pm | 5:40pm | 12:40pm | 9:40am |
| Joshua Buatsi vs Callum Smith | 7:45pm | 4:45pm | 11:45am | 8:45am |
Parker has sought to suggest he can make Dubois quit, in reference to a 2020 loss to Joe Joyce, where he went down on one knee and was counted out.
Ex-WBC light middleweight champion Mora suggested that has followed the Briton until recent times, pointing to his narrow loss against Oleksandr Usyk as a turning point.
"They were power jabs," he added. "To get hit by a jab, knocked out by a jab, he could have gotten up. He had that reputation as a quitter.
"But what a comeback. Against Usyk, I still believe that was a knockdown. It's incredible what he's done. He's shed that reputation as a quitter."

Watch Daniel Dubois versus Joseph Parker and the full Last Crescendo fight card, including Artur Beterbiev vs Dmitry Bivol 2, live on DAZN Pay-Per-View.
The PPV is available to buy now at £19.99 in UK and $25.99 in US.
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