"Elangovan had resigned recently. His resignation has been accepted," party general secretary Janardan Dwivedi told PTI.
Congress, which had contested 41 seats as part of the DMK-led alliance, could manage only eight of them and Congress Vice-President Rahul Gandhi is understood to have expressed his displeasure over the result.
"Our party's state unit chief submitted his resignation on June 15 itself as electoral results were not on expected lines," party functionary V R Sivaraman, a confidant of Elangovan, had said yesterday.
Several names have begun doing the rounds for the TNCC chief post. They include Chidambaram-loyalist and former Chennai Deputy Mayor Karate Thiagarajan, former state minister in the MGR cabinet Su Thirunavukarasar and former Lok Sabha MP Manicka Tagore.
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While factions opposed to Elangovan claimed that he put in his papers after Rahul Gandhi expressed displeasure over the party's poll performance, Sivaraman rejected it.
Sivaraman had said Elangovan quit owning moral responsbility for the party's performance. Elangovan had submitted his resignation in the office of party chief Sonia Gandhi in Delhi on June 15, a day after he called on Rahul Gandhi.
In April, ahead of the Assembly election, Chidambaram had expressed dissatisfaction over seat-sharing with DMK, saying his party was allotted "seats which we do not need."
The seat-sharing talks were steered by Elangovan in the presence of party senior leaders including Mukul Wasnik.