Mabizela arrived in the country on Thursday with the squad on their return from touring his homeland and, subject to negotiations, medical and work permit, should complete a transfer to the club.
Radebe, who joined Leeds from Kaizer Chiefs in 1994, insists the 22-year-old has got what it takes to more than follow in his footsteps.
"I've watched him in a few matches now, and he's a talented defender," said the experienced defender. "He's going to be one of the best ever to come out of the country. He's already shown he's a leader. He not only leads by example, but he likes to be involved in everything regarding the team, and that's a very good sign.
"He's a big boy in terms of structure, and that is definitely going to help as the other players will take him seriously. I've heard him speak in camp. He's not as soft as some players. He's a bit bossy too, and what I've noticed in particular is that he commands the respect of most of the players in the squad.
"So I would say he has it all, and from what I have seen, there are very few areas in which he needs to improve. I don't think he will have any difficulties captaining South Africa. The more matches he plays, the better he will undoubtedly become."
Leeds United defender Lucas Radebe says that his successor to the South African captaincy Mbulelo Mabizela is going to be the 'best ever' to come out of the country.