Prime Minister Narendra Modi will undertake a reshuffle of his council of ministers at 10 am on Sunday, a top government official said.
It will be the third such exercise since he took over in May 2014.
"A process has been set in motion for the swearing-in ceremony at Rashtrapati Bhavan around 10 am on Sunday," the official said.
Minister of state for skill development and entrepreneurship Rajiv Pratap Rudy, Sanjiv Kumar Balyan, Faggan Singh Kulaste and Mahendra Nath Pandey have resigned ahead of the rejig.
Water resources minister Uma Bharti also resigned from the Union council of ministers.
Rudy is expected to be given an organisational assignment in the BJP, sources close to him said.
Earlier in the day, Union minister Mahendra Nath Pandey was appointed Uttar Pradesh BJP president in place of deputy chief minister Keshav Prasad Maurya, creating one more vacancy in the council of ministers.
AIADMK's Thambi Durai and K Venugopal are being seen as among likely representatives of their party in the Cabinet if the Tamil Nadu party joins the Modi government. At least two members of the JD(U) are also likely to join.
There are several vacancies in the government while some senior ministers, including Arun Jaitley and Harsh Vardhan, are holding additional portfolios.
(With PTI inputs)