The former heavyweight champion announced his retirement in August 2017 after he was knocked out in the 11th round by Joshua at Wembley earlier that year.
Joshua, meanwhile, has been searching for a new opponent ahead of his first fight in the United States after Jarrell Miller was forced to pull out due to three failed drugs tests.
In March, Joshua’s promoter Eddie Hearn revealed that Klitschko had held ‘exploratory’ talks about a possible comeback.
