he Ukrainian, who was champion for nine years, will meet Briton Tyson in a rematch in Manchester on 9 July.
“Losing feels good,” Klitschko, 40, told BBC Radio 5 live. “I’m glad that my hand was not raised that night.
“Failure is not an option unless it is the only way to get better, and I had to get better. I needed a push to get better and I got it. I feel it.”
Klitschko, then the WBA, IBF and WBO champion, lost on a unanimous points decision in Dusseldorf, with Fury’s victory considered a huge upset.
“I didn’t show my full potential in the fight,” Klitschko said. “Physically I was in one of my best shapes, but mentally I wasn’t there, not present in the ring.
“After a while, you get used to defending and not conquering the man in front of you. It will be different on 9 July.”