Volkswagen CEO Martin Winterkorn faces losing his job on Friday at a scheduled board meeting.
He is expected to see a leadership challenge after it was disclosed that Volkswagen cheated US air pollution tests for diesel cars, with an electronic switch to bypass analysis, says Reuters.
Volkswagen bosses have apologised for the activity but it faces fines of up to $18 billion and a backlash from consumers, and it may see sales plunge in the country.
Shares collapsed 20% on Monday when markets reopened after the news broke last week.
It will be bad news for the German car maker which has been rocked by sales declines in Russia and China in recent months and is now seeking to develop higher sales in Iran and the Middle East.