Newspapers said the 29-year-old driver had sought an urgent hearing on Monday at the Victorian Supreme Court to claim unfair dismissal.
First practice for the season-opener in Melbourne starts on Friday, March 13.
Sauber have signed Sweden's Marcus Ericsson and Brazilian Felipe Nasr as their race drivers, with Italian Raffaele Marciello as reserve.
Sauber were not immediately available for comment.
(Reporting by Alan Baldwin, editing by Toby Davis)
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