London- Tyson Fury has urged Derek Chisora to accept his offer to fight him in a trilogy bout.
The WBC heavyweight champion, 33, said he was retiring after his last win over Dillian Whyte in April.
But speaking on Instagram, Fury revealed he had made an offer to veteran heavyweight Chisora, whom he has beaten twice.
“You’re running, Derek, from the trilogy,” Fury said. “You call yourself war, you should call yourself chicken.”
Zimbabwe-born Chisora, 38, defeated Kubrat Pulev on points in July and has resisted calls for him to retire.
The victory over Pulev ended a three-fight losing streak and Chisora said after that win he would like to fight Deontay Wilder or Fury.
“I’ve decided to come back to boxing because I can be the first heavyweight world champion in history to have two trilogies,” added Fury, confirming reports he was seriously considering fighting again.
“I’d always say I’d fight Derek Chisora at the end of my career.”
Fury beat Chisora on points in 2011 before defeating him in their rematch three years later.
Chisora’s promoter Eddie Hearn confirmed last week the Harare-born boxer had received an offer from Fury’s camp but had turned it down as it “wasn’t enough money”.
Fury also claimed on social media he has hired a new trainer, his long-time friend and fellow fighter Isaac Lowe.