The party's Lok Sabha MPs Jaisingh Thiyagaraj Natterjee (Tuticorin), Senguttuvan (Vellore) and R P Marutharaja (Perambalur) extended their support to Pannerselvam.
The MPs called on Panneerselvam at his Greenways Road residence this morning and extended solidarity to him.
Four AIADMK Lok Sabha MPS -- P R Sundaram, K Ashok Kumar, V Sathyabama and Vanaroja -- had already switched over to the Chief Minister's camp, pledging support to him. Rajya Sabha MP V Maitreyan is also in the Panneerselvam camp.
AIADMK Fisheries wing Joint Secretary K A Jeyapaul, a Minister in the 2011-16 Jayalalithaa cabinet and former Erode Mayor Mallika Paramasivan also joined the Panneerselvam camp today.
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On February 5, AIADMK General Secretary VK Sasikala was elected as the party's Legislature Leader, a step towards her elevation as Chief Minister of Tamil Nadu.
However, two days later, Panneerselvam had raised a revolt against her, alleging he was forced to step down for her.
AIADMK has 37 MPs in Lok Sabha and 13 in Rajya Sabha.