C V Wigneswaran will be sworn in by President Mahinda Rajapaksa here on October 7, Tamil National Alliance's senior leader Suresh Premachandran said.
73-year-old Wigneswaran has been a magistrate and a judge of the District Court, High Court, Court of Appeal and Supreme Court of Sri Lanka.
"The TNA councillors would take oaths as members of the NPC in Jaffna on October 11", Premachandran said.
The decisions followed a meeting between the Sri Lankan President and the leader of the TNA, R Sampanthan held this morning.
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In the run upto the September 21 Northern Provincial Council (NPC) election the TNA had protested against northern governor's campaigning for the ruling party.
The governor G A Chandrasiri is a retired Major General who had functioned as the Commander of the government troops in Jaffna during the civil war against the LTTE.
The TNA in a letter of protest to Rajapaksa had urged action to end the military's involvement in the election.
Their seeking a mandate for the north, based on the Tamil minority's demand for self-determination came under heavy criticism by the country's Sinhala Buddhist majority.