Shannon Briggs and KSI entered into a heated social media spat over the controversial result of the Logan Paul fight last Saturday.
The 26-year-old YouTuber, real name Olajide Olatunji, picked up a split decision victory over his fellow internet personality at the Staples Center in Los Angeles.
But Paul, 24, was furious over the result after referee Jack Reiss deducted points from him for illegal back-of-the-head blows when KSI hit the canvas in the fourth round.
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Former two-time heavyweight champ Briggs, who trained Paul for the fight, went on Instagram Live with KSI and called for a third fight to complete the trilogy.
But KSI ruled out another fight with his fierce rival and Paul's trainer fired back by saying there was "some shady s**t" going on in their rematch.
When the British internet star argued that he didn't have a knockdown count in the fight, Briggs hit back by saying Paul still "won the rest of the round" even though he suffered a two-point deduction.
Briggs continued by calling KSI "crazy" after suggesting that his opponent didn't attack him for the rest of the round and saying Paul "was too afraid."
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KSI shut down the 47-year-old former boxer's call for a rematch, despite Briggs arguing that the biggest rivals "always had to fight it out three times."
Paul's trainer also made a bold claim that Matchroom chief Eddie Hearn was "trying to sabotage everything," which was met with a howler of laughter from KSI.
Briggs was furious with the result after the fight and slammed the referee's decision to deduct points from Paul.
He told iFL TV: "I thought he did great, but the referee shagged us with the two points.
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"That hurt us, that hurt our momentum, gave KSI a break. Jack was out of pocket for that one. It changed everything. [Logan] would have won.
"I thought Logan started slow, but he got to work, he dropped him, he was the better boxer, the better technique. He was just under the weather. I thought he won the fight.
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"Those two points were disgusting. I don't know what the hell happened. I don't know what got into Jack to take two points. The guy had 30 minutes to recover.
"He was dirty, he was swinging wild, hitting my man in the back of the head all the time. And yet Jack thought [Logan] was being dirty, that's not right. I smell a rat. Let's go champ."
Paul came out after the match to blame his defeat to KSI on a cold, saying that he had been under the weather for the "past three days."
Featured Image Credit: InstagramTopics: Logan Paul, Boxing News, Boxing, Instagram Live, KSI, YouTube