The trainer and fighter involved in the sparring session that left Nick Blackwell in hospital are to appeal against the punishments handed down by the British Boxing Board of Control.
Trainer Liam Wilkins had his licence withdrawn and light-heavyweight Hasan Karkardi was given a six-month suspension after the incident.
Blackwell, 26, was forced to retire after suffering a bleed on the skull in his defeat to Chris Eubank Jr last March.
However, he sparred with Karkadi in November and subsequently required surgery to reduce swelling on his brain.
A joint-statement from Wilkins, 21, and Karkardi, 29, read: "We will be challenging both the board's procedure and their findings as to the facts, which were made in the face of a [sic] substantial documentary and witness evidence to the contrary.
"We will be making no further comment until the appeal process has concluded."
At the time the BBBofC announced the punishments, it described Wilkins' conduct as "detrimental to the interests of boxing".