Official sources said the final seat-sharing arrangement is likely to be announced soon and the list of candidates for the first phase of polls will be out by October 4 or 5.
The nomination process for the first phase, under which 71 of the total 243 seats will go to polls, begins on Thursday and ends on October 8.
The Chirag Paswan-headed LJP has indicated it will fight on 143 seats if it does not get a "honourable" deal from its allies. In 2015, it had contested 42 seats and won two. The JD(U) was then part of the opposition alliance which decisively defeated the NDA.
Chirag Paswan chaired a meeting of LJP leaders at his residence here on Wednesday over the polls.
The strained relations between the JD(U), headed by Kumar, and the LJP have put the alliance under pressure as BJP
attempts to play a balancing role.
Bihar BJP president Sanjay Jaiswal and state Deputy Chief Minister Sushil Kumar Modi also attended the party meeting.
The Bihar assembly polls will be held in three phases on October 28, November 3 and November 7, and the counting of votes will take place on November 10.
On Wednesday, the BJP appointed former Maharashtra Chief Minister Devendra Fadnavis as its in-charge for the assembly elections, the party said in a statement.
Fadnavis and Yadav are heading to Bihar where they are expected to discuss poll strategy with party leaders and also with allies.