The trouble started during Question Hour when senior BRS MLA T Harish Rao asked the government to announce a date by which the RTC staff would be recognised as government employees.
They sought to file a privilege motion against the officials responsible, before Speaker Gaddam Prasad, but returned after the latter did not respond to their phone calls.
In two separate letters, Prabhakar said he was forced to wait by the official machinery during a Kalyana Lakshmi cheque distribution programme to beneficiaries in Sangareddy.
Upon receiving a communication from both AIMIM and CPI, Speaker Gaddam Prasad Kumar recognised them as the party floor leaders in the House on Wednesday.
Revanth Reddy, his cabinet colleagues, BRS Working President Rama Rao, AIMIM MLAs and lone CPI MLA Kunamneni Sambasiva Rao were present when Prasad Kumar's nomination was submitted to the legislature secretary.
The Speaker election is scheduled to be conducted in the Assembly on Thursday. With the opposition parties BRS and AIMIM supporting his candidature, Prasad Kumar's election is likely to be unanimous.
The Congress won 64 seats in the recently concluded assembly polls and its ally CPI got one seat. BRS bagged 39 seats while AIMIM was victorious in seven seats. The BJP secured eight seats.