KSI calls out Conor McGregor - as YouTuber insists he's 'down' to step in for PRIME partner Logan Paul to take on MMA star in boxing bout

Starting his career as a YouTuber, KSI, real name Olajide Olatunji, 31, has moved into the boxing world, taking part in a plethora of boxing fights, with the most high-profile being against Tommy Fury.