Nath, is likely to be named as the Finance Secretary, as she is the senior most officer in the finance ministry.
Due to retire on March 31, she has been working as secretary in the expenditure department of the Finance Ministry since April 2008.
According to sources, the official letter for the appointment is likely to be issued to Monday.
Gopalan is working as financial services secretary in the Finance Ministry since January 1, 2010.
Chawla is the 1973-batch Gujarat cadre IAS officer and he took charge as finance secretary in May 2009.
Nath, R Gopalan, along with Disinvestment Secretary Sumit Bose and Revenue Secretary Sunil Mitra would be the key persons assisting Finance Minister Pranab Mukherjee, who will unveil the budget for 2011-12 in the Lok Sabha on February 28.