Former Home Minister of Puducherry P Kannan would be the Congress nominee for the Rajya Sabha poll to be held on October 3.
The election was necessitated following the election of V Narayanasamy to the Lok Sabha in May.
Mr. Kannan had merged his Puducherry Munnetra Congress (PMC) with Congress recently.
The Congress and its allies have a strength of 23 legislators in the 30 member Puducherry Assembly.