Karnataka batsman Karun Nair has been appointed Unmukt's deputy as the All-India Senior Selection Committee picked a 15-member squad.
All the matches will be played here at the MA Chidambaram Stadium with the final scheduled on August 14.
Meanwhile, Ambati Rayudu has been picked to lead the India A side in the two-Test series against South Africa A starting August 18 in Wayanad.
Squads:
India 'A' squad for tri-series: Unmukt Chand (capt), Mayank Agarwal, Manish Pandey, Karun Nair (vice-captain), Kedar Jadhav, Sanju Sanson, Axar Patel, Parvez Rasool, Karn Sharma, Dhawal Kulkarni, Sandeep Sharma, Rush Kalaria, Mandeep Singh, Gurkeerat Singh Mann, Rishi Dhawan.