The notification for the bypoll to the Palair Assembly constituency would be issued today and polling will be held on May 16, the Election Commission announced.
The bypoll is necessitated by the death of senior Congress MLA and former minister Ramreddy Venkata Reddy.
The bypoll assumed significance after the TRS decided to field Roads and Buildings Minister Tummala Nageswara Rao, who is an MLC now.
Congress had earlier appealed to the other parties to let a family member of Venkata Reddy elected unopposed in view of the "services and clean image" of the departed leader.
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Ramana has promised to get back to the PCC president after consulting TDP chief and AP Chief Minister N Chandrababu Naidu, it said.
TDP leaders in Khammam district, however, had earlier discussed the name of former MP Nama Nageswara Rao but the party has not made any official announcement on the matter.
The former MP and Tummala Nageswara Rao were understood to be at loggerheads when the latter was in TDP.
The TRS has been on a winning streak, since it assumed power in the 2014 elections, emerging victorious in the bypolls held for Warangal Lok Sabha and Narayankhed assembly constituencies and also the civic body elections in Hyderabad.