He will leave Friday on an official tour to India, his office said.
Rajapaksa is to deliver a lecture on Sri Lanka-India relations in Bangalore, it said.
Rajapaksa was controversially appointed the prime minister by President Maithripala Sirisena late October, triggering an unprecedented constitutional crisis which lasted for over 50 days. The Supreme Court later restored of Ranil Wickremesinghe as prime minister.
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