The pair are Chiefs fans, and pledged their support for the team when they were presented with Amakhosi jerseys by defender Lorenzo Gordinho on Thursday.
"I have never been to a Soweto Derby and this will be my first," fast-bowling sensation Rabada is quoted as saying by the club's website.
"I hope my presence will help us win."
Batsman Bavuma added: "I have been a Chiefs fan all my life. I am really a hard-core supporter. I attend matches whenever possible, although the last Derby I saw live was two years ago.”
Rabada produced the second-best bowling figures (13/144) by a South African in a Test against England earlier this week, while Bavuma recently became the first black cricketer to score a Test century for the country.