Arun was India's bowling coach during Shastri's previous tenure as Team Director and the latter had insisted on his appointment in his soon-to-start second stint with the Indian team.
The decision to appoint Arun, on a two-year contract, was taken after Shastri met the Committee of Administrators (CoA) and BCCI officials, including acting President C K Khanna and Secretary Amitabh Chaudhary.
"I was very clear in my mind what my core team would be and you have just heard that," Shastri said after Chaudhary announced the appointment in a press conference.
His appointment marks a complete u-turn for the BCCI, which had named Zaheer Khan as bowling consultant initially before clarifying that it was for specific overseas tours. There is also, no clarity on Rahul Dravid's position as batting consultant either.
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"All depends on their availability, it depends on individuals, the number of days they want to give but their inputs will be invaluable and they are most welcome," was Shastri's cryptic response on queries regarding Zaheer and Dravid.
"I would like to thank the CAC because it is a privilege and honour to be India's coach. And I would like to thank the CAC for considering me worthy enough for the job," he said.