Kell Brook has threatened Amir Khan that he could miss the weight limit and come into their fight heavier than agreed.
A six-figure fine is in place at Friday's weigh-in for either fighter for every pound above the 149lbs limit that they may weigh.
Khan and Brook will then settle their score on Saturday night, live on Sky Sports Box Office.
"You'll have to wait to see if I make weight, or if I come in heavier," Brook has teased.
"I might pay a few hundred thousand pounds.
"I might play games. I might be on weight, I might not."
Sky Sports Johnny Nelson said: "It plants a seed in Amir's head - is it under or over?
"It will cause a panic."
Sky Sports' Matt Macklin said: "I think it is probably mind-games but I don't think it's out of the question that he comes in at 150lbs and thinks: 'I'll just swallow the fine, but I'll be fresher and have more energy and think I can win'.
"But either way, he's planted a seed in Amir's head now. They're going to be discussing that."
Anthony Crolla said: "I think it is mind-games. Now it's that point, if he's a pound heavy, with what's been said, Amir has to take the fight.
"But that pound could be a huge difference with the frame of Kell. It's so interesting, so tough to call.
"If Kell is a much different animal, which he would be a few pounds heavier, alright he might get hit with a fine, but this isn't just about money, this is personal.
"People aren't going to think it gives Kell a huge advantage in who wins the fight, they're not going to look back and say, 'in that fight, Kell came in a few pounds heavier.'"
Brook is a former world welterweight champion (147lbs) who insists that former world super-lightweight champion (140lbs) Khan has imposed the 149lbs catchweight for their
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