Radebe, who joined the show as a professional dancer in 2018, said returning in the role was “beyond anything I ever imagined”.
“This show has always stood for joy, heart, and togetherness, and I feel deeply honoured to now help carry that magic forward,” he said.
“To do it alongside the formidable Emma Willis and the utterly brilliant Josh Widdicombe makes it even more special.”
He said he was “ready – sequins, nerves, and all”.
Stand-up comedian Widdicombe previously competed on the show in a festive special and said: “Dancing the Charleston dressed as a penguin for the 2024 Christmas Special of Strictly remains my career high point, so I am giddy with excitement, honoured and a little overawed to be given the chance to step into the biggest shoes in television.
“I adore Emma and Jojo and can’t wait to spend my weekends with them. I’ll dust off the penguin costume.”
Presenters Zoe Ball and Rylan Clark have both recently revealed they were turned down for one of the roles.