"Common sense dictates that the minute the decision was made to sell the GM Rayong plant in Thailand is the exact moment that serious questions would have emerged about Holden's future in Australia.
"Operationally, the announcement of the sale of the plant in Thailand where Australia's top-selling Holden vehicle, the Colorado ute, was manufactured was announced at the same time as the closure of Holden.
Other submissions to the Senate investigation, which will hold a public hearing on Monday, have indicated Holden was still taking on new workers on the very day the closure decision was revealed.
Global automotive giant General Motors may have been formulating plans to axe the Holden brand in Australia well before a shock decision was announced in February, a Senate inquiry will be told.
In its own submissions to the Senate inquiry, General Motors Holden said the decision to retire the brand was made only a few days before the public statement.