Khan's PTI emerged as the single largest party in the country's National Assembly after the July 25 election. However, it is short of numbers to form its government independently.
He also termed Modi's telephone call to Khan on his victory in the 2018 polls a welcoming sign to begin a new chapter in relations between the two countries.
On Saturday, PTI spokesman Naeemul Haque told reporters that the party chief will take oath as the prime minister before August 14.
