Whittaker claimed the interim championship in July 2017 with a unanimous decision win over Cuban Yoel Romero. He was later promoted to undisputed champion when Georges St-Pierre vacated the title after being diagnosed with colitis - an inflammatory reaction in the colon.
Injury and illness has limited Whittaker to just one fight since then, again against Romero, where he took a split decision win in a non-title fight.
It was an illness early in 2019 that opened the door for Adesanya to swoop in to the title picture. Whittaker was forced to withdraw from a title defence against American Kelvin Gastelum in Melbourne in February after undergoing stomach surgery. While he was recovering, the UFC booked a fight between Gastelum and Adesanya for the interim middleweight title, after the Kiwi had rocketed through the rankings.
Adesanya met Gastelum in Atlanta in April and claimed the interim title with a unanimous decision win.
After having to withdraw from two fights booked on Australian soil in the past, Whittaker assures he would be ready to go come October 6.
"I'm doing everything I can to make sure I'm ready for the date. I'm feeling the strongest and fittest I've ever been. I look to finally put on a show.
"The amount of time I've had off was, I think, necessary just for my mind and body; to really recuperate myself a little bit more, just get stronger and get better. I feel that I've done that and I look forward to my performance in October…I'm itching, mate, I really am."