KSI and Tommy Fury will headline the Misfits Prime card on Saturday.
Logan Paul and Dillon Danis will also share the headline spot on the fight card.
This will be YouTube star KSI's sixth outing in boxing gloves - having won four of these by KO.
The 30-year-old released 'KSI: In Real Life' - a biographical documentary following the Watford lad and his family - in January on Amazon Prime.
Who is KSI's father Jide?
Jide Olatunji - KSI's father - was born in Ibadan, Nigeria and features in many of KSI and his brother Deji's YouTube videos, often as the cameraman.
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In the Amazon Prime documentary, the UK-based influencer-boxer spoke about how he had struggled to form a relationship with his father as a younger man and said "we just became strangers".
On his relationship with the 57-year-old now, KSI added: "A lot of people are disconnected with their parents or their dads.
"Like the idea of not even hugging him or saying, ‘Oh, I love you dad, it was just a foreign thing. Back in the day, like, it’s crazy it never happened.
"And because he’s always working, it made sense, cause he had to do like two jobs and we didn’t have the time to bond ever.
"We just didn’t know each other. He was just a guy who provides and that was it.
"We didn’t have a relationship, we didn’t have that bond. That’s what I’m trying to fix now, that’s what I’m trying to create.
"It’s cool cause now I’m taking him to Arsenal games, talking to him all the time."
Who is KSI's mother Yinka?
Yinka Olatunji was born in Islington and was raised Catholic by Nigerian parents - she also features heavily in her sons' YouTube videos.
After KSI's second fight with bitter rival Paul, the 55-year-old tweeted: My son is a warrior #TeamKSI we did it! Thank you all for your support and commiseration to Logan Paul, he tried.
And she has also expressed her displeasure at the idea of a bout between her two sons and said: "You do not fight family."
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