Johnny Nelson has fired back at Eddie Hearn after the promoter labelled the former boxer's rumours about Tyson Fury as 'absolute rubbish'.
Hearn played down reports of Fury being 'dropped' in sparring but Nelson has told the 44-year-old 'don't play with me'.
Fury is currently in Saudi Arabia preparing for his huge undisputed fight against Oleksandr Usyk on February 17.
Nelson revealed earlier this week that he had heard reports that the Gypsy King was struggling in the gym.
Johnny Nelson has ranted about Eddie Hearn following his Tyson Fury claim
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Nelson told talkBOXING: "I’m hearing rumours of what’s happening in camp - I’m hearing that he’s getting turned over in the gym.
"So this thing about appetite when he’s in the gym, I mean, he got shown his a***.
"I’m hearing these things and I’m thinking has he taken his eye off the ball, or has time caught up with him?"
Hearn responded by dismissing Nelson's claims and said he has heard that Fury is having a 'great camp'.
He told talkSPORT: "I saw the piece yesterday with Johnny Nelson and Spencer Oliver.
"Johnny Nelson was adamant that Fury had been dropped in sparring by Jai Opetaia.
"Jai Opetaia is with Matchroom, he's a tremendous fighter. As far as I can see, it's absolute rubbish.
"Jai Opetaia flew in, he did five rounds with Tyson Fury. I mean, he will set about him as he always does, but as I understand it nobody got hurt or dropped in the spar.
"So I think it's absolute rubbish, sparring stories are sparring stories. As I understand it, Fury's having a great camp and I think he's taking it very seriously."
But in the latest instalment of the back-and-forth argument, Nelson has ranted about Hearn.
He has doubled down on the claims he heard about Fury, saying he has heard the reports from two reliable sources.
The former WBO cruiserweight champion warned Hearn that he would 'rung rings around' him when discussing boxing and has told him to focus on promoting.
Nelson told talkSPORT on Thursday: "The devil in the detail, number one. Number two, I said before, promoters ought to stick to talking about promoting, managers speak about managing.
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Johnny Nelson doubled down on the rumours he heard about Tyson Fury
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"Fighters stick to talking about fighting. So when I say a fighter has shown his a*** in sparring, did I say he got put down?
"I’ve heard the rumours about him getting put down. I am saying he got manhandled in sparring.
"So the devil is in the detail, when Eddie does that himself and he will play with words.
"Now I know from two reliable sources within the camp that Tyson has had a rough time, I know that.
Tyson Fury will fight Oleksandr Usyk in Saudi Arabia on February 17
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"And Eddie is jumping on that for whatever reason and Eddie is a great promoter, one of the best ones out there. But don’t play with me with that.
"When it comes to talking about boxing I will run rings around you. So we will see when it comes to fight night.
"If there is any truth to this at all, I am sure it will come out."