Fabian Vettel, younger brother of four-time Formula 1 champion Sebastian, will race in the DTM-supporting Audi TT Cup in 2017.
Vettel, 18, will be making his debut in the international touring car scene.
He has previously raced in German karting championships such as ROK Cup Germany with Ralf Schumacher's KSM team, and also tested a Volkswagen Golf in the marque's Polish series in 2014.
The Audi TT Cup was created in 2015 to replace the Volkswagen Scirocco R-Cup on the DTM support bill, with its field mainly comprising youngsters at the beginning of their careers.
Last year, two Audi Sport racing academy drivers Nicklas Nielsen and Sheldon van der Linde also contested the championship, but it was Joonas Lappalainen who took the title.
The 15-car 2017 field will also include an academy member in 16-year-old Hungarian female racer Vivien Keszthelyi, as well as drivers from Lichtenstein, South Africa, Australia, Great Britain, Spain, Germany, Italy, Switzerland and the Netherlands.
"We are delighted with the international diversity of this year’s cohort," said series boss Philipp Mondelaers. "Our junior drivers have clearly stepped up throughout the introductory course."
The 2017 Audi TT Cup season will kick off on 5-7 May at Hockenheim in support of the season-opening DTM round.