Klitschko has a minor injury which he suffered in training and the fight has now been postponed until next year.
Joshua's promoter Eddie Hearn announced this morning that with the Ukranian sidelined and with no decision made over whether the WBA title would be on the line, the fight could not happen on the date suggested.
"We've been in deep negotiations for a few weeks now waiting on the decision from the WBA," Hearn said.
