Anthony Joshua has insisted he is not “ducking” any fighter.
He accused his heavyweight rivals throwing challenges at him of just “making noise” on social media.
Joshua, a Nigerian, holds the WBA, IBF and Ibo versions of the world title, with Deontay Wilder the WBC champion and Joseph Parker having the WBO belt.
Wilder wants a unification bout, but no firm offer has been made.
Joshua says it is one thing talking and acting, but negotiations could not be done over social media
Wilder who beat fellow American Bermane Stiverne on Saturday to extend his unbeaten record to 39 wins from 39 fights, has been taunting Joshua for never fighting outside of Britain in his 20 professional bouts.
“There’s one thing talking and acting, but negotiations don’t happen over social media,” said Joshua.
“I’m serious about becoming undisputed heavyweight champion and we’re making sure these guys who are making noise will back up what they’re saying.
“It’s no problem if Wilder wants to fight early next year, but no offers have been made to me.
Joshua added “Let’s present him with an offer, and see how they feel about that. If Wilder’s not making an offer, we’ll do it on my terms.”
Another fighter seeking a fight with Joshua is 25-year-old Parker, who has won all 24 of his professional contests – 18 inside the distance.