Singh, the original co-founder of the no-frills airline, is in the process of acquiring 58.46 per cent stake from the Marans as part of a revival plan.
In a filing to the BSE, SpiceJet said it has filed an application with the Civil Aviation Ministry for "security clearance of Ajay Singh for his appointment as director of the company".
The application has been filed as per civil aviation requirements, it added.
Ministry sources said that the file relating to Singh's security clearance was sent to the Home Ministry last week.
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Singh decided to re-board the budget carrier, which he had co-founded with UK-based Kansagra family in 2005, after the airline was almost grounded due to fund drought.
As part of the revival plan, Kalanithi Maran, his wife Kavery Kalanithi and Managing Director S Natrajhen have already resigned from the SpiceJet board.
Meanwhile, in a statement today, SpiceJet said it has witnessed an overwhelming response for its super sale offer.
The offer concluded on February 1.
According to the statement, the offer saw the highest demand for New Delhi-Srinagar sector, followed by Vijayawada- Hyderabad route.