TDP MLA from Sattupalle Sandra Venkata Veeraiah Sunday said he had decided to join the TRS in the interest of development of his constituency.
"It would be an injustice to people who made me win (the election), if I cannot develop it. That is the only objective. I am not changing party with selfishness or for my personal reasons," Veeraiah said.
They said they would consult legal experts and quit assembly membership and seek fresh mandate if necessary.
The strength of the Congress in the 119-member Assembly is 19 and it would come down to 17 with the decision of the two MLAs to join the TRS.
The TDP has two MLAs and would be left with only one legislator following Veeraiah's decision to leave the party.
The Congress has fielded a candidate in the election (MLAs quota) to be held to fill five vacancies in the council.
The TRS has nominated four candidates, leaving one seat to its ally AIMIM.
The TRS' strength is 88, with two other MLAs also supporting the party.
AIMIM has seven MLAs.
The Congress was banking on the support of the two TDP MLAs in the MLC election.
However, its chances have now been dented with the decision of the two Congress MLAs and the TDP MLA to join the TRS.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)