Former leader of the opposition, Sudip Roy Burman and three other dissident MLAs of Congress met the Speaker on Tuesday last and handed over a letter signed by six MLAs informing him that they joined TMC and demanded recognition as the main opposition party.
A senior assembly official said Debnath has begun the process of individually hearing and verifying signature of dissident Congress legislators.
The leader of the dissident group, Burman said he received the notice to meet the Speaker on June 22 and another dissident MLA, Asish Saha said he was asked to meet the Speaker on June 20.
The other MLAs could not be contacted.
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Burman had earlier been elected the leader of the TMC legislature group in Tripura and is expected to stake claim to the post of the Leader of the Opposition.
State Congress President Birajit Sinha and two other MLAs remain with Congress.