Tyson Fury insists he would not be attempting a comeback if he thought he was unable to defeat world heavyweight champion and British rival Anthony Joshua.
Personal issues and legal troubles have kept Fury out of the ring since November 2015, when he defeated Wladimir Klitschko for the WBA, IBF, IBO and WBO titles which are all now in Joshua's possession.
Fury will resume his unbeaten professional career on June 9 at the Manchester Arena against an as-yet unnamed opponent, with all roads leading to an eventual showdown with Joshua.
Asked whether he believes he can defeat Joshua, Fury told ITV's Good Morning Britain: "Of course I do or I wouldn't be sat here today. I'd be off in Spain drinking a sangria somewhere.
"Of course I think I have the ability, I just think I have too much movement and natural boxing skill to lose to somebody like that. He's very tough and strong and he has a lot of learned ability but he doesn't have the natural gift of the sweet science.
"I'm very proud of what he's done, he's achieved a lot in the sport and he's an inspiration to young people coming through. But hold on to the throne because I'll be taking it back. Everyone in heavyweight boxing know who the real champion is."
Joshua is currently in talks for a potential unification with WBC world champion Deontay Wilder. If a deal is reached, that contest would happen at the end of the year. The two sides are currently haggling over an offer of $50 million, with an upside, that Team Wilder presented to Joshua.
If a deal is not reached, then Joshua would likely move forward with a mandatory world title defense against once-beaten Alexander Povetkin of Russia, who stands in the top position under the WBA and the WBO.