Dennis McCann's jacket is causing quite the stir at BBC Sport... (see 17:33 BST).

Meanwhile, we think we are just a couple of minutes away from hearing from Oleksandr Usyk and Tyson Fury.

Kal Sajad
BBC Sport at Guildhall, London

Tyson Fury usually comes suited and booted to these events, often in a custom-made outfit.

He was wearing an orange hoodie promoting the fight when I passed him in the lobby earlier. I wonder if there has been a costume change.

Whatever he wears, it can't be any worse than that Dennis McCann jacket from earlier.

While we wait for Oleksandr Usyk and Tyson Fury to arrive, we've been trolling through some of Matchroom's backstage pictures and come across this gem.

Image source, Matchroom

Some of the face-offs for you, no real fireworks. Security were quick on their toes.

Image source, Matchroom

Image source, Matchroom

Image source, Getty Images

So we may be stretching here since technically Tyson Fury and Oleksandr Usyk faced off in the ring, but the last time the two faced off in a traditional sense was during fight week.

They faced off twice, once at the news conference on Thursday and then at the weigh-in the next day.

Both occasions drew some raised eyebrows with Fury going from refusing to engage to shoving Usyk in the space of 24 hours.

As Kal Sajad just said, which version of Fury will we see today?

The fighters on the undercard are currently facing off which means we're likely moments away from hearing from heavyweight pair Oleksandr Usyk and Tyson Fury.

If you're wondering why Chinese food always gets brought up when British heavyweight Johnny Fisher is talking, it's because his dad, known as 'Big John', has quite the following on social media because of his large takeaway orders.

You can read more on Fisher and Big John here.

Image source, Matchroom

Kal Sajad
BBC Sport at Guildhall, London

Boxing is a tough game and who knows what will happen with Johnny Fisher and Moses Itauma. Perhaps they will be world beaters or maybe Anthony Joshua and Tyson Fury's shoes are just too big to fill.

But both prospects are massively likeable and speak well. Fisher is a funny bloke and Itauma oozes confidence in a respectful way.

When talk just turned to the two potentially fighting each other in the future, there was no bad blood or fake animosity.

Kal Sajad
BBC Sport at Guildhall, London

Tyson Fury arrived at the Guildhall earlier this afternoon. When asked by a member of the Queensberry social media team if he's ready for the rematch, the Gypsy King replied: "Nope", before walking into the venue.

Will he be in a similarly sarcastic mood tonight? You never quite know which Fury will turn up, but I'm pretty sure I won't be short of options for a headline.

Back to that historic night in May and emotion poured out of Oleksandr Usyk in his post-fight news conference. It clearly meant a lot to the Ukrainian.

Peter McGrail was just making fun of Dennis McCann's jacket, but I quite like it.

Thoughts?

Image source, Getty Images

Kal Sajad
BBC Sport at Guildhall, London

I've got a train to catch tonight and I was genuinely worried a back and forth between Dennis McCann and Peter McGrail may never end.

The super-bantamweight contest is highly competitive and probably the undercard fight I'm most looking forward to.

One of things Tyson Fury said immediately after his first loss was to dismiss the possibility of retirement.

It was never on the Englishman's mind. Thank god for that, because now we get the rematch.

Super bantamweights Dennis McCann and and Peter McGrail are currently getting into it in an amusing back-and-forth.

Among the insults are "sausage" and a few more phrases I shouldn't repeat here.

Dev Sahni, our host for the night, has to interrupt to move the news conference on - I think those two could have argued all evening...

Kal Sajad
BBC Sport at Guildhall, London

This is my second visit to the Guildhall– it is where the Daniel Dubois v Anthony Joshua news conference was held last month.

The venue, which dates back to the 15th century, is pretty remarkable. Everywhere you look there is either a statue of a Lord or a bust of a member of the royal family.

There are high ceilings and stained glass windows, along with artwork presumably worth well into the millions. Then you have me, a lad from Chatham who is really bringing down the lavishness of this gaff.

The first fight was so close so no wonder the statistics tell a similar story.

• Punches thrown: Fury 496 vUsyk 407
• Punches landed: Fury 157 v Usyk 170
• Power punches landed: Fury 95 v Usyk 122

• Percentage of power punches landed: Fury 45% v Usyk 47%

What will we see the second time round? More power punches landed than jabs in the first fight. Will Fury be more aggressive...

As Kal has just said, they're chatting heavyweights on the undercard.

Frank looks happy.

Image source, Getty Images

Kal Sajad
BBC Sport at Guildhall, London

"He is the future of heavyweight boxing," those were there words of promoter Frank Warren when talking about heavyweight prospect Moses Itauma.

Itauma will face Demsey McKean in a real step-up fight on the undercard.

Kal Sajad
BBC Sport at Guildhall, London

There is a decent media turnout, although it was more packed at the Daniel Dubois v Anthony Joshua news conference which was held here last month.

The event was only confirmed to media earlier this week. But I'm sure any empty seats will be filled up with Tyson Fury and Oleksandr Usyk's respective entourages when the main eventer take to the stage.

Before Oleksandr Usyk and Tyson Fury answer questions, we're going to hear from the fighters on the undercard, which includes British heavyweights Moses Itauma and Johnny Fisher.

Here's the fight card for the event on 21 December in Saudi Arabia in full:

• Oleksanrd Usyk v Tyson Fury - WBC, WBO & WBA heavyweight titles
• Israil Madrimov v Serhii Bohachuk - super-welterweight
• Moses Itauma v Demsey McKean - heavyweight
• Johnny Fisher v Dave Allen - heavyweight
• Dennis McCann v Peter McGrail - super-bantamweight
• Isaac Lowe v Lee McGregor - featherweight