Hearn had lashed out at the Gypsy King and his team for making "zero attempt" to save the bout after Fury was ordered to fight Deontay Wilder again but Warren has suggested that his fellow promoter was far too confident in his announcements regarding the blockbuster clash.
Warren told The Sun newspaper: "There was a clause in there regarding confidentiality and that we would make announcements together, so that we would all be on the same page. Within a very short space of time, Eddie Hearn breached that agreement by making announcements. Every week there was something, announcements about announcements, the fight is done and so forth.
"That was totally untrue. The fight wasn't done, it wasn't signed and every time I did an interview I just said the truth. All these announcements, that were being made on a regular basis by Hearn, I don't think helped and caused a lot of confusion."
Warren also claims that Hearn and Joshua's team were aware of the arbitration hanging over Fury when they began negotiations for the fight.
He said: "At the start of the year, all parties involved in the fight - fighters, promoters, managers - all signed a contract as to how the negotiations would take place. In that agreement there was a clause that made it very clear there was an arbitration situation going on as far as Tyson is concerned - so everyone was aware of it and that we were awaiting the outcome of that."