Former heavyweight champion Wladimir Klitschko has made his prediction for Saturday's return against unbeaten titleholder Anthony Joshua, which will take place in front of an expected 90,000 at London's Wembley Stadium. 

But if you're looking to hear the prediction from Klitschko (64-4, 53 KOs), who returns to the ring for the first time in 17 months since losing his three world titles to Tyson Fury, it's going to cost you. 

Klitschko, 41, who was quick to remind during Wednesday's news conference that "I'm not Nostradamus," recorded his prediction on a video and saved to a USB stick that will be sewn into the robe he will wear inside the ring before facing Joshua (18-0, 18 KOs) on Saturday at 4:15 p.m. ET live on Showtime.

The native of Ukraine will auction off the robe after the fight to raise money for his charity foundation.

"Do not ask me after that fight, what is on the stick," Klitschko said. "The only person who is going to be able to open it up and watch it is the person who buys this robe, with all the money going to the Klitschko Foundation."

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The Klitschko Foundation, which the former champion operates with his older brother and former WBC titleholder Vitali, focuses on projects in the field of sports, science and education. Klitschko has used his fights to raise money in the past, including his 2008 unification bout against Sultan Ibragimov when fans were offered the chance to pay $199 to have their name on his robe.  

Joshua, 27, will make the third defense of his IBF title. The two fighters will also be competing for the vacant WBA belt that Fury relinquished last October to focus on mental health and substance abuse recovery. 

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Klitschko is also looking to join Muhammad Ali and Evander Holyfield as the only men to win a piece of the heavyweight championship on three occasions. 

"Is it a degradation that I'm challenger and underdog in this fight after so long in this [sport]?" Klitschko said. "I don't think so. It's great. I feel young, hungry, humble and totally obsessed with my goal.

"I'm so obsessed with my goal, that I realized life is a circle. I see myself in A.J., I believe I know how he thinks, where he goes, what he's going to do, and how the actual fight is going to be."