The Prime Minister would be demitting office on May 17, a day after the Lok Sabha elections results are announced.
He had earlier this year announced his retirement, after a decade at the helm of two successive United Progressive Alliance (UPA) governments.
On the eve of his demitting office , the Prime Minister is to "address the people" in a farewell speech.
Congress leaders had always spoken of the relationship between the Prime Minister and Sonia Gandhi as an ideal division of labour, which saw perfect harmonisation between the government and the party.
AICC has always maintained that there cannot be any better relationship between a party president and a Prime Minister and had often dismissed as "rumours and disinformation" reports of differences between the two.