Trainer of Daniel Dubois, Don Charles, says he isn't happy about the fact his former fighter Derek Chisora could be the IBF heavyweight champion's next opponent.

The IBF confirmed to The Ring last week that on April 22, they would order Dubois to defend his title against against their No. 2 contender Chisora, who finds himself in a mandatory position after the sanctioning body nixed plans for Martin Bakole and Efe Ajagba to fight for that honour.

Chisora (36-13, 23 KOs) has taken on all comers throughout his career, but his last two victories against Joe Joyce and Otto Wallin, both of which he won on points, have thrusted him into world title contention once again.

The Londoner says that after his next fight, his 50th, he will retire from the sport. And he wants to go out by fighting Dubois (22-2, 21 KOs) for his world title at Tottenham or Wembley.

The prospect of Dubois vs. Chisora is an awkward one for Charles, who trained 'Del Boy' from the start of his career and into numerous high-profile fights against the likes of Tyson Fury, Vitali Klitschko, David Haye and Dillian Whyte.

Should a fight with Chisora come to fruition, Charles may have to do the unthinkable, in his mind, and train another man to knock the 41-year-old out.

"My first son in boxing, [Chisora] gave me the entrance to the boxing industry. I don't know what kind of luck I've got, " Charles told Louis Hart for The Ring.

"What are the chances of that [Dubois vs. Chisora]? It's not something I want, I'm an emotional guy, I'm a sensitive guy, it's not something I want to materialise but I'm happy for Derek because it's going to be his 50th and final fight.

"Had it not been against someone I'm currently training, I'm happy for him to be going out on a bang, what a way to exit and cap off his colourful and successful career. But, this is where the emotion comes into it.

"It's not something I would want to see, Derek is, if he was a mother, he gave birth to me as a coach."

Charles even notes two scenarios similar to this have already played out previously in his career as a trainer.

"This keeps happening to me," he continues. "When I first started training Derek, his 10th fight was for the British title against Danny Williams. He was a junior at my amateur club, he was my sparring partner, he's 10 years my junior. I used to help him and bring him up, I helped raise that young man.

"And Derek fought him for the British title, against a kid I used to raise, I didn't want that, but it happened. It wasn't nice for a guy who I'm training to go and stop Dan in two rounds.

"Fast forward years later, during Anthony Joshua's development as an amateur, I had involvement in developing him very early in his career.

"Then when it comes time for Anthony to become three-time world champion, guess who was there? Me, with a fighter I'm training to stop that happening. There's a pattern developing. Now I have Daniel, potentially against Derek. I'm happy for Derek but not happy he's going to be potentially facing Daniel. What kind of luck have I got?"

Dubois' potential clash with Chisora, which the IBF will order to take place by June 21, is far from set in stone, however.

Unification fights trump mandatories and Dubois is likely to at least explore an undisputed clash against WBA, WBO, WBC and Ring heavyweight titleholder Oleksandr Usyk.

If that fight takes place next, Chisora may have to wait to fight either the winner, or someone else for a vacant title.