Conor McGregor and Dustin Poirier could face a suspension and a fine if their weigh-in turns physical tonight.
The lightweights will come face to face for the final time before the first bell of their trilogy fight when they take part in the ceremonial weigh-in.
Both men earlier scaled 156lb to ensure the third part of their rivalry will go ahead in Las Vegas tomorrow night.
And later they will salute the thousands in attendance at the public showcase of each fighter on the UFC 264 card.
But when they are brought together by UFC president Dana White, they may already have been warned about the consequences of their face-off turning violent.
Last month, flyweight fighter Lauren Murphy revealed that the fighters weighing in had been told of the punishment.
"They just told us at weigh-ins that if we touch our opponent at ceremonial weigh-ins for any thing other than a fist bump, or a handshake, or high five, we will be pulled from the card, suspended, and fined," she tweeted.
And while it is unlikely either McGregor or Poirier will risk being pulled from the trilogy fight, the Irishman did lash out at his opponent following last night's press conference.
McGregor had ramped up his trash talk during his appearance as he attempted to rile Poirier. And when they came face-to-face he attempted to kick his opponent, but missed.
The Dubliner's weigh-offs have frequently boiled over, including his first with Poirier in 2014 with the two men kept apart by White.
McGregor was almost on the receiving end of a blow during his second staredown with Nate Diaz in 2016 while he lashed out at Khabib Nurmagomedov on the eve of their fight two years later.
The UFC may have been forced to warn its fighters after the cancellation of a bout in April after Jeremy Stephens shoved Drakkar Klose during their weigh-in.
Klose woke on the morning of the fight with a neck injury and was taken to hospital where a CT scan results revealed he had suffered a cervical sprain of the neck and concussion.
He was pulled from the fight and the bout was cancelled with Klose saying: "I'm sorry to everyone who was excited for this fight.
"I tried to do everything I could to stay in this fight but these issues are out of my control."
Stephens, meanwhile, was unrepentant, claiming he lashed out because Klose had been to close.
"I just have zero tolerance for that type of disrespect," he said.
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