IBF heavyweight champion Joshua, 28, battles 41 year-old Klitschko in a three-belt clash that also sees the IBO and WBA ‘Super’ versions on the line when the pair collide at Wembley Stadium on April 29.
Speaking about the possibility of knockout, Joshua said: “A knockout is the cherry on top but to win whichever way is very possible.
“And this is the fight that can change (a fighter) from champion to legend overnight. It is the fight that will draw massive attention and can change the way people view you in your industry.
“This is the start of that legendary campaign,” he added.
Klitschko, who last fought when losing his clutch of belts to Tyson Fury in November 2015, is hoping to prove he still has what it takes to compete with the new breed of top division contenders.
“The first on the first step my goal and target to become three-time world champion,” said the Ukrainian.
“I’ve held myself back for a year and a half and look forward to be back in the ring to become three-time world champion.
“The second step is all has consequences so what is going to happen if? If Anthony will win this fight I will congratulate you. When I will win this fight, I will help you to come back.
“The third step I need to have somebody to help me get in the perfect shape so I will have sparring partners my direct competitor who want to knock me out and we will probably look for the same guys.
“They will help me get in better shape. The fourth step I imagine standing in the middle of this stadium holding those belts in my hand to all those fans, 80, 90,000.
“I have imagination in my head to hold those belts in my hand.
“The fifth and final step is I am obsessed with my first goal to be champion again.”
