Dr H Ngurdingliana would be the party's candidate for the election to Chalfilh assembly seat while Raghvendra Singh has been approved for Bhatpar by Congress Chief Sonia Gandhi, a party release said here.
Ngurdingliana, son of veteran Congress leader and former state assembly Speaker Dr H Thansanga, had contested unsuccessfully from the same constituency in 2008.
Bhatpar seat fell vacant following the death of Uttar Pradesh Sports and Youth Welfare minister Kameshwar Upadhayay.
Chalfilh seat was lying vacant since the death of Parliamentary Secretary Chawngtinthanga of ruling Congress on September 16 last year.
The notification for the bypolls was issued on Jan 30 and the process of filing of nominations is on till Feb 6.
After scrutiny of nominations on Feb 7, the last date for withdrawal of candidature is Feb 9. Counting of votes will take place on Feb 28.