Anthony Joshua believes Oleksandr Usyik is the best boxer in the world in a warning to stablemate Tony Bellew.
Joshua, who defends his heavyweight titles against Alexander Povetkin on Saturday, is a possible future opponent for Usyk.
"He's [Usyk] has all the belts and he’s at the highest weight so I'd say him," he told JD Sports .
After his fight was announced last week, Bellew said: "I'm going into this fight with absolutely nothing to lose because the whole world thinks I'm going to get smashed.
"There is no greater test than Oleksandr Usyk, one of the most feared men in boxing.
"I have everything to gain. On November 10, I'm going to do something that no-one has ever done before - I'm going to knock out an undisputed cruiserweight champion of the world."