The members of Sirisena's delegation are to be decided after Rajapaksa presents the names of his delegation.
The meeting between the President and former President is to take place tomorrow at the Presidential Secretariat.
Sirisena has given two times for the meeting to Rajapaksa to decide. The times are 10 a.m. and 2 p.m.
Meanwhile, speaking to 'Divaina' newspaper, former minister Gamini Lokuge said that said that the discussion would be held under two conditions.
The conditions are : Not arriving at an agreement with any party to set up a national government and setting up a government with the political parties and groups allied with the SLFP.
Rajapaksa's group has decided that discussions would continue should President Sirisena agree to these conditions.
Also, if these conditions are agreed to, the former President is prepared to lead the election campaign of the SLFP from that day onwards, Lokuge has further said.
However, if the President disagrees, former President Rajapaksa is prepared to contest the next Gen. election from a separate group.
Sending Ranil home
Meanwhile, speaking to 'BBC Sandeshaya', SLFP media spokesman Dilan Perera said that tomorrow's meeting will be held without any conditions and no one, including UNP affiliated journalists can put a stop to it.
He added that idea of this discussion would be to 'send Prime minister Ranil Wickremesinghe home and that this is the general call of all SLFPers.'