Vuyani Bungu says Malcolm Klassen will not discover his fullest potential and be able to take over where Bungu and other world champions left off because his trainer, Manny Fernandez, is not the right mentor for him.
"That boy is a star. He just needs to be jacked up a little bit. But Manny won't bring the best out of him because he does not understand Malcolm's style of fighting," said Bungu.
"Look at his fight with Mzonke Fana. Klassen would have easily stopped Fana with another trainer in the corner.
"Malcolm also got frustrated after realising that the fight was not going his way, and his trainer failed to calm the boy down," said Bungu who has become a top boxing mentor.
Bungu is worried that Klassen could lose a fight he should win when he fights Lehlohonolo Ledwaba in a 10-rounder at Emperors Palace on July 5.
"By right, Klassen should win, but he will get frustrated again because Ledwaba will not be compromising. That could be the end of Klassen's brilliant talent," added Bungu, who reigned supreme for five years as the IBF junior featherweight king with 13 defences.
But Fernandez said he has devised a "perfect" fight plan that will shock pundits.
The shootout between "The Stone" and "Hands of Stone" will be the main supporting bout to the Cassius Baloyi-Manuel Medina War 2 that will be staged by Golden Gloves.
Baloyi's IBO junior lightweight belt and the vacant number one spot in the IBF's ratings will be at stake. This six-bout programme has received a financial injection from Gree Air Conditioners.