JOE JOYCE accused Anthony Joshua, claiming that he showed "all his best bits" during a leaked sparring session.
The heavyweight duo shared several rounds at Team GB's Sheffield HQ.
They went from being team-mates to becoming rivals, and they recently exchanged words online.
Joyce offered to replace Oleksandr Usyk after Joshua looked like he was out of his rematch.
Soon thereafter, online sharing began with one-sided footage of AJ sparring in the favor of the pair.
Joyce responded to The Metro, saying: "He leaked or his team leaked footage of sparring, all the best bits.
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"Some of the sparring that I have seen is from when we were drilling for certain things.
He can only throw left hooks. You can only throw straight arm shots.
"I don’t know what’s going on with Joshua these days. I haven’t spoken to or seen him for a while.
"Something has happened to his head. He seems to be more vocal on Twitter, and I guess I took the bait.
SIGN UP DEALS AND FREE BETS - THE BEST NEW CUSTOMER OFFERINGSLet's see what happens. He would be a great opponent, and I hope to do so one day.
Joshua claimed that Joshua had won the stoppage in the amateurs online. Joshua has already boxed with Joshua.
Joyce, 36, responded: "For him that to bring it up, he has kept onto that, beating myself in one round.
"Now that I'm a threat to him he wants everyone to know that he knocked out me in a round.
Joshua, 32, was defeated by Usyk (35), in September, but the pair are expected back together this year.
Joyce also warned that if the British star loses once more, it could end their fight for good.
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He stated, "Let's watch how he does with Usyk. Then we will get in touch."
"But, if he loses against Uysk I might think: "Why would you fight me?" I want belts.
"He already has the belts but lost them. I want to win the belts, and keep them."
