"It has been three months now since the merger of EPS-OPS faction. Months are passing by, what about hearts?," Maitreyan, who is a member of Rajya Sabha, said in his Facebook post.
Queried about his remarks, Maitreyan, who was in the OPS faction, said he had already expressed his views and did not wish to say anything more.
Senior party leaders K P Munuswamy and Manoj Pandian refused to comment on Maitreyan's remarks.
On various occasions, the leaders of the two faction have maintained that they no longer have differences.
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Deputy Chief Minister Panneerselvam after meeting Prime Minister Modi in October had told reporters that he had no differences with Chief Minister Palaniswami and all the decisions were taken inclusively.
Following party supremo Jayalalithaa's death in December last year, two factions led by Panneerselvam and V K Sasikala were formed.