"But Tony can punch himself, he can whack. And Stevenson has been punched down before, he can be got to."
Bellew, who lost a world title challenge against Welshman Nathan Cleverly in 2011, was making confident noises at the final pre-fight news conference on Wednesday.
"All I want to do is nail him with everything I've got," said Bellew, who has 20 wins (12 KOs) and one defeat.
"I'm talking about whatever it takes and whatever I have to do. On Saturday I'm going to be world champion.
"This little man [Stevenson] is not keeping me on the floor."
Stevenson, whose one defeat came at super-middleweight, countered: "You've never fought anyone like me. I am going to knock you out."
Awaiting the winner could be 48-year-old American legend Bernard Hopkins, holder of the IBF belt.
But also in the mix is unbeaten Russian Sergey Kovalev, who defends his WBO belt against Ukrainian Ismayl Sillakh on the undercard.
It is the first title defence for Kovalev, who stopped Cleverly in the fourth round three months ago in Cardiff to take his world title., external
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