TNCC President EVKS Elangovan alleged that the bypoll may not be held in a fair manner.
In a statement, he claimed officials had failed to prevent an "unusual" situation from prevailing in the constituency, bypoll to which was necessitated following the resignation of AIADMK's P Vetrivel on May 17 to make way for his leader to fight election from a city constituency for the first time.
Elangovan also alleged that money was being distributed in the constituency.
DMK, PMK and MDMK besides others had announced boycotting the bypoll raising apprehensions over the fair conduct of the election besides alleging money distribution.
They had also held that the need to contest the election did not arise as elections to the 234-member state assembly are due next year.
DMK chief M Karunandhi had sarcastically said: "we clearly know how democracy will be respected in the bypoll," and asked "if we do not know how it was a carnival of money" in the Srirangam bypolls held in January this year.
Jayalalithaa returned as Chief Minister on May 23 following her acquittal by the Karnataka High Court in the disproportionate assets case. She has to be elected as MLA within six months of taking office.
Earlier, she was disqualified as Chief Minister, besides as MLA of Srirangam, following her conviction in the case by a Bengaluru trial court.