The number of party MLAs backing Dhinakaran has now reached 21.
Aranthangi MLA E Rathinasabapathy had also reportedly expressed his support for Dhinakaran.
Earlier 19 pro-Dhinakaran MLAs had revolted against Tamil Nadu Chief Minister K Palaniswami and petitioned Governor Ch Vidyasagar Rao to remove him.
Speaking to reporters after meeting Dhinakaran at his Adyar residence here, Kalaiselvan questioned Palaniswami's decision to merge the Amma faction led by the latter with that of O Panneerslevam's Puratchi Thalaivi Amma.
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The Panneerselvam faction had voted against the Palaniswami government in the February 18 trust vote, he said.
Asked if Dhinakaran would attract more support, Kalaiselvan responded in the affirmative.
"Some may not have a conscience but many others do as they remember the efforts taken by Chinnamma (jailed AIADMK chief V K Sasikala)," he said, apparently referring to Sasikala's efforts to ensure continuance of the government following Panneerselvam's revolt in February against her.
Panneerselvam had then alleged he was forced to make way for Sasikala to become chief minister.
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