Conor McGregor and Dustin Poirier will complete the fight-week formalities later today when they weigh in for their trilogy bout.
The lightweights will clash in Las Vegas on Saturday night to settle their rivalry and to determine the next title challenger.
But first they must step on the scales and ensure they weigh no more than 156lb – one pound over the championship lightweight limit.
McGregor and Poirier – along with the rest of the UFC 264 card – will have one hour from 9am local time (5pm UK time) to weigh in.
The fighters will then step on the scales at 4pm local time (midnight UK time) in front of thousands of fans for the ceremonial weigh-ins.
McGregor will take full advantage of the UFC’s weight rules to scale more for his trilogy bout with Poirier than he did for their January rematch.
The promotion allows fighters taking part in non-title bouts to weigh in one pound lighter than for bouts when a belt is on the line.
And six months ago McGregor scaled ‘championship weight’ when he registered 155lb, one pound lighter than Poirier.
But the Irishman has no plans to strip any more weight from his frame than is absolutely necessary ahead of Friday’s weigh-in.
Asked about not taking to his stool after the first round of the rematch, McGregor told BT Sport: “It was nice to showcase that my cardiovascular abilities are improving but there will be none of that in this fight.
“There is nothing being given for free here, there were a lot of freebies in the last fight.. 155lb on the scale, that’s gong to be 156lb on this scale.
“Free shots in the octagon, not taking the stool etc. All of these things are gone, I’m taking everything now.”
McGregor must avenge his January defeat by Poirier if he is to keep alive his hopes of regaining his lightweight title.
And during a heated press conference last night, the Irishman vowed to put a vicious end to the rivalry.
“You’re getting walked like a dog in that octagon,” he said before attempting to lead the crowd in a chant about Poirier’s wife Jolie.
“This is my bread and butter, this is what wakes me up in the morning with fire in my belly,” he added. “Errors to correct, tactics to prepare for, I’ve had a great camp and a great focus on the opponent.
“I’m going to go through his head, put holes in it and take it off his shoulders. He’s done here, this is it for him, it’s the end of the road.
“Saturday night he’s getting walked around that octagon like a dog and put to sleep.
“This will be beautiful, it will be another feather in the cap, it’s what I love to do. I love to come in here, defy the odds, do the unthinkable and put on a show.”