The 31-year-old Scot, who formerly played professional rugby for Jersey Reds, was ready to take on Croatian fighter Igor Mihajlovic in Charleroi, Belgium, in a heavyweight bout this Saturday.
But on Monday the British Board of Boxing Control advised him that they had refused to sanction the fight, on the basis that it would not allow him to make his debut outside of the UK.
Campbell said that the decision was a ‘sickener’ for him after three months of preparation but he would view it as a ‘learning curve’.
‘It was very disappointing, to be honest with you. They said that the board decision was final and you’re not allowed to make your debut outside the UK,’ he said.
‘I’m sure they’ve got their reasons but there were a lot of us waiting on this show. With everything going on in the world there’s a limited number of shows going on. But what can you do?’
He added: ‘I have been training for this fight for 12 weeks now, but I train all the time anyway. I like to keep myself fit and not too far away from being able to compete.
‘It was a bit of sickener to put in all that hard work and then to hear that it wasn’t going to be sanctioned. But it’s part of the sport and it’s probably a good learning curve.
‘In professional boxing people can get injured or cut in sparring. All sorts of things can happen that cause a fight to get called off at the last minute.’
More in Wednesday's JEP.