"Both scenarios are in discussion, but I haven't seen a finalised calendar," Theissen told reporters at the Belgian Grand Prix [ Images ] when asked whether Bahrain or Australia featured first on a provisional calendar shown to teams by Formula One supremo Bernie Ecclestone [ Images ].
Australia has hosted the season-opener since 1996, although Bahrain took the slot in 2006 when the Melbourne [ Images ] race was moved back to avoid a clash with the Commonwealth Games [ Images ] in the same city.
Melbourne was a twilight race this year, to fit in better with European television audiences, and the possible later date on the calendar would coincide with the start of daylight saving time in Europe at the end of March.
Canada was dropped from the calendar this year after a contractual disagreement between Montreal organisers and Ecclestone.
Theissen, whose team won in Canada in 2008 but are now fighting for their survival after BMW [ Images ] announced they were pulling out at the end of the year, said he thought there is "an opportunity but not a contract" for the race's return.