"I will visit Tripura on August 9. In coming days we will form the next government in Tripura," she told TMC's Martyrs Day rally here.
In a setback to Opposition Congress in Tripura, its six dissident MLAs had joined TMC last month making it the main Opposition party in the Left-ruled state.
Sudip Ray Barman, who led the Congress dissidents, too was present at the rally.
"We will follow the ideals of Mamata Banerjee to oust the Left regime of Tripura. We are confident that we will be able to do so in the next Assembly polls. People in Tripura are fed up with the Left rule there. The Left Front in Tripura will have the same fate as the Left Front in West Bengal faced in 2011," he said.