EDDIE HEAR believes Dillian Whyte has changed and is now a "bad motherf r".
The Gypsy King dominated the sixth round at Wembley, knocking out the Body Snatcher with a fierce uppercut.
Fury, 34, has accused Fury of using "illegal" pushes and has blasted Mark Lyson as referee after Fury's knockout loss.
Hearn promoted Whyte previously, earning PS5.8million to the WBC champion's PlayStation26.2m for Saturday fight.
The Matchroom chief, who wasn't involved in the showdown, admitted that he worried about the Brixton boxer because he was friendly with Fury during last week’s pre-fight media visits.
Anthony Joshua's promoter told The DAZN Boxing Show: "It was well-documented that it was an amazing payday.
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He's made a lot. He could still be involved with some great fights.
"Can he win another world championship?" He might be a very strong heavyweight when all the belts are gone.
"But I feel that mindset is everything. He had the wrong mindset during that fight and [Joshua] did the same when he boxed Oleksandr Usyk.
"You need someone to flip the switch at just the right moment."
FREE BETTING AND SIGN-UP DEALS - THE BEST NEW CUSTOMER OFFERINGSHearn then compared Whyte to Joshua in December 2015, the angry man who lost to Joshua.
He said: "The DillianWhyte that boxed AJ... That guy was a poor motherf r.
"Back then, if Tyson Fury had tickled Dillian in the press conference in head-to-head in the head-tohead, Dillian might have taken him out right away.
"It was brilliant mind games by Tyson Fury."
