Soon after the swearing-in, Modi congratulated Panneerselvam and others who took oath.
"I congratulate Thiru O Panneerselvam & others who took oath today. I hope Tamil Nadu scales newer heights of progress in the years to come," the prime minister tweeted.
"Centre assures all possible support to CM Thiru Edappadi K. Palaniswami & Dy CM Thiru O Panneerselvam for the growth of TN," he added in another tweet.
He was interim chief minister twice when Jayalalithaa stepped down due to cases against her, and then chief minister following her death on December 5, 2016.
His close aide K Pandiarajan was sworn-in as minister for Tamil official language and Tamil culture.
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