Anthony Joshua says he remains angry at himself after losing to Oleksandr Usyk but adds that it’s fuelling him every day.
Joshua, 32, surrendered the WBA, WBO and IBF heavyweight titles to the 34-year-old Ukrainian in September after just the second defeat of his career.
A rematch is “in the pipeline” and expected to be staged in early 2022, when Joshua aims to avenge that loss and become a three-time world champion.
“I know I can be better than that night,” the Briton told BBC Sport.
“It’s easier to say than it is to do, but within my heart and soul, my brain and body, I truly feel I’ve got a lot more to give.
“I’m angry. It’s growing, but it’s fuelling me every day.”
“I think people still recognise me as champion, even though I haven’t got the belts round my waist. They know I’ve got the capability of becoming champion.”