Mr Modi, 63, spoke to Ms Jayalalithaa over phone and thanked her for her letter on Friday congratulating him for his party's 'magnificent win' in the elections.
"Selvi (Ms) J Jayalalithaa, wished him a very successful tenure as Prime Minister of India. The Hon'ble Prime Minister-designate assured the Hon'ble Chief Minister that there will be absolute co-operation between the Government of India and the Government of Tamil Nadu," a state government release in Chennai said.
Mr Modi's assurance came in the wake of the AIADMK chief saying in her letter that she looked forward to a meaningful era of Centre-state cooperation with the BJP leader at the helm of affairs.
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