Anthony Joshua insists he is not “ducking” any fighter and says his heavyweight rivals are just “making noise” on social media.
Joshua, 28, 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, 32, wants a unification bout, but no firm offer has been made.
“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.
“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.”