Swiss driver Simona De Silvestro will have to find a new team if her Supercars career is to continue past this year.
Kelly Racing confirmed on Friday New Zealander Andre Heimgartner will stay with the team for 2020.
Kelly Racing is cutting back from four Nissan Altimas this year to running just two Ford Mustangs next season.
The decision to stick with Heimgartner alongside co-owner Rick Kelly means De Silvestro and Garry Jacobson are both without a seat for next year.
De Silvestro became the first full-time female driver in Australia's premier touring car championship for more than four decades when she signed a three-year deal in 2016.