Holden's temporary and casual workers could lose their jobs at the car maker's Elizabeth plant because the high Australian dollar has hit export growth, South Australian Premier Jay Weatherill says.
But the permanent workforce will not be hit by the job cuts, he says.
Workers are expected to be told this week how it will affect them.
The premier made his comments on Wednesday after news of the decision became public.
"It does indicate that the future security of Holden's will depend on us being able to ensure that Holden's invest in a new platform which will secure jobs into the future," the premier said in Adelaide.