Rico Verhoeven has called for a rematch with unified heavyweight world champion Oleksandr Usyk and an apology from officials after the controversial stoppage in Egypt on Saturday.
The Dutchman troubled Usyk for long spells and came close to one of boxing's biggest upsets before being dropped in the 11th round.
The contest was then stopped amid a late flurry, with replays suggesting the bell for the end of the round may already have sounded.
"[I want] just an apology. What else can we do? I can't demand anything else," the 37-year-old told BBC Sport.
Verhoeven says his team lodged an appeal with the WBC the following morning.
"Mistakes can be made because we're all human and that's OK," he added. "But all I'm looking for actually is: 'yeah, sorry guys, this could have gone differently - this is something we have to look at and hopefully this doesn't happen in the future'.
"That's it and then let's continue from there and get to the rematch."
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What next for heavyweight division after Usyk's win?
Verhoeven reigned for more than 4,000 days as a kickboxing world champion but had only one professional boxing fight prior to Saturday's bout, a win over a journeyman in 2014.
The unbeaten Usyk, meanwhile, is a two-weight undisputed champion, having dominated at cruiserweight before becoming undisputed heavyweight champion.
The 39-year-old Ukrainian remains undefeated in 25 professional fights and is widely regarded as one of the best fighters of his era.
"His legacy has been amazing anyway, but I definitely feel we made a crack in the guy that was considered invincible," Verhoeven said.
He is unsure whether a rematch will materialise straight away. Germany's Agit Kabayel is the mandatory WBC challenger for Usyk's title and faced-off with the champion in the ring in Cairo.
"I'm just coming into the sport of boxing so this world is new for me. I don't know exactly how things work. I just go with the flow but I know I shocked the world," Verhoeven added.
If the rematch does not happen, Verhoeven is "open" to a potential fight with former UFC champion Francis Ngannou, who pushed Tyson Fury close on his boxing debut before being stopped by Anthony Joshua.
"Let's see what pops up next. But I have to be honest, it's got to be big. I feel like I'm the uncrowned king," he said.
'Referee took it away from me and Usyk'
A win for Verhoeven would have arguably surpassed James 'Buster' Douglas' shock victory over Mike Tyson in 1990 as the greatest upset in boxing history.
Both corners were given the scores under the open scoring system after round eight, with the contest level. Verhoeven - who felt he should be ahead on the cards - says it took a significant mental toll as the fight moved into the championship rounds.
Coached by Peter Fury for more than a decade, Verhoeven is no stranger to elite-level sparring and preparation.
Fury has since said he was on the same flight back as referee Mark Lyson and that the official told him he did not hear the bell to signal the end of the 11th round.
Verhoeven himself says he did not hear the bell either, only the clapper around 10 seconds before the end of the round.
"I knew Usyk was going to push it and I knew we were already there, so I just got on the defence and tried to ride it out. And then the referee jumps in.
"He did not just take it from me, he took it from Usyk. If he had the chance to knock me out in the 12th round, he would have done it to settle the fight without debate.
"Pretty strange because in other championship fights I've been dropped multiple times earlier and still come back to win. I know that's one of my superpowers. I can get hit, recover, and come back.
"There are so many opinions and things to say – like 'what if in the 12th round he would have definitely knocked you out?'
"But no, we cannot look into the future. We cannot predict anything. If we listened to all the predictions I wouldn't have gone past the first half of the fight, and I did."
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