David Haye doubts Tony Bellew will carry the same desire into the ring for their rematch.
The heavyweight rivals went face to face for the first time since their return was confirmed for the O2, London, December 17, live on Sky Sports Box Office.
Haye insists there will be no bad blood or war of words in the build-up to this one, but after using a bank robbery analogy for Bellew's surprise win in their first fight, the Londoner also questioned his motivation.
He told Sky Sports News: "We are tough guys and we are willing to put it on the line again and he's doing it again yet he is a multi-millionaire now after the first fight, so is he going to have the same desire going into this rematch than he had for the first one?
"The first time around he said it to anyone that would listen, that his motivation was about securing the future of his family - like I did a few years ago.
"He has finally done that now, so he is going back into the ring, but what is his motivation?
"Well, he says he's got a screw loose, well anybody who has a screw loose doesn't know he's got a screw loose."
"I don't know what his desire is. He says he doesn't like boxing, he doesn't like training, but I do, I love it."
Haye was impressed with Bellew's decision to agree to the rematch and admits he didn't believe he would get the chance to avenge the 11th-round loss in March.
He said: "I respect him as an athlete. I respect he is willing to get back in the ring, more than anything he did in the first fight.
"You've got to give him nothing but respect because as he said, it is a dangerous place and he's the underdog going into this one, now."
Watch Tony Bellew vs David Haye II, from the O2, London, on Sunday, December 17, live on Sky Sports Box Office.