"Nayyar's term as Executive Vice Chairman of the company expires at the close of business hours on August 9, 2015. The Board of Directors (have) appointed him as an Additional Director.
"He will be a non-executive director and has been designated as 'Vice Chairman'," the Mumbai-based firm said in a filing to the BSE.
Besides, the Board has approved the appointment of V S Parthasarathy as an Additional Director.
"Both these appointments will be effective from August 10, 2015," it added.
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He worked with the World Bank for over 10 years and was the founding Chairman and Managing Director of state-owned Gas Authority of India.
He has served as the Managing Director of HCL Corporation Ltd and as the Vice Chairman of HCL Technologies Ltd.
In addition to his responsibilities at Tech Mahindra, Nayyar has served as a director on the boards of Venturbay Consultants, Mahindra Logisoft Business Solutions, Mahindra Holidays and Resorts India, The Great Eastern Shipping Company Limited, Greatship (India) Ltd, Vidya Investments and Tech Mahindra Foundation.