Kell Brook's promoter, Eddie Hearn, has cheekily suggested Gennady Golovkin may not be in the best condition ahead of Saturday's much-anticipated world middleweight title bout at London's O2 Arena.
Brook will step up two weights in an ambitious attempt to claim the WBC and IBF belts of middleweight king Golovkin, who has recorded knockout victories in 32 of his 35 unbeaten fights.
Much has been made of the Briton's increased comfort in making a 160lb weight limit, rather than the 147lb mark he was required to hit as a welterweight.
Following the final pre-fight news conference on Thursday, Hearn told Sky Sports: "I'm going to throw this out there. I didn't think Gennady Golovkin looked that great.
"I thought he looked a little bit drawn in the face. They scuttled off after and didn't want to talk to any of the media.
"Maybe I'm clutching at straws but I'm going to clutch at them because we need to. We know the task. Everything has to go our way but as [has been the case] all week, Kell Brook is the calmest person involved in the fight and that gives me confidence."
Abel Sanchez, the trainer of Golovkin, had delivered a put-down to Brook and his team during the news conference, stating: "It takes more than a 10-week scientific experiment to topple Gennady Golovkin."
For his part, the undefeated Brook reiterated his belief that a step up to middleweight will increase his potency.
"Before I have fought 60-70 per cent, this time I will be at 100 per cent," said the 30-year-old.
"This fight was meant to be and this is my time to shock the world."