Amir Khan believes David Haye's strength and power will prove too much for Tony Bellew in their grudge match at The O2.
Khan insists Bellew is a great fighter but can't see him successfully stepping up to heavyweight when he settles his rivalry with Haye, exclusively live on Sky Sports Box Office on March 4.
Sky Sports Month Pass for just Â£20
New customer winter madness offer: Sky Sports Month Pass for just Â£20
Bellew has questioned the desire of his 36-year-old opponent and is confident that he will force him to quit if the fight goes into deep waters.
The Merseysider has been given special exemption by the WBC to keep his cruiserweight world title to take part in the domestic clash, but Khan is not convinced it was a risk worth taking.
"I think he's maybe just tried to bite too much by going in the ring with a heavyweight," Khan told Sky Sports.
"I like Bellew. I think he's a great fighter and a great champion. I think he should have stayed at his own weight category.
"David's a natural heavyweight and he's a very big puncher. Can he deal with that power? Can he take them big shots?
"David has also got a lot of speed. I can't see [Bellew] winning this fight. I am sorry to say that. David is much bigger and much stronger and has a little bit more experience going into that fight."