BJP, which withdrew support to the Shibu Soren government in Jharkhand after the JMM chief voted for the UPA in cut motions in Parliament and then put its decision on hold, is likely to take a final call on the issue on Thursday.
"The BJP parliamentary board will come out with a final decision tomorrow," a top national leader of the party said on Wednesday.
BJP has remained firm on its stand that JMM should get letters of support from all its 18 MLAs before the party went ahead with forming a government.
A senior BJP leader had said in Delhi on Tuesday that party was not open to any other JMM offer, like continuing with Soren as chief minister, and may prefer to withdraw support in case JMM Legislature Party leader Hemant Soren failed to bring on board all his party MLAs to back a BJP-led government.
Senior JMM MLA Simon Marandi, who opposes a re-alignment with the BJP, however, said "My stand is the same. Don't go with the BJP. I will open my cards at the appropriate time."
Meanwhile, a jailed JMM MLA who offered to vacate his seat for the chief minister to contest the elections to enter the assembly has been allowed by a court to meet Speaker CP Singh.
The district and sessions judge, NK Srivastav allowed the plea of JMM MLA Paulus Surin, who is in jail on Naxal-related charges and ordered the superintendent of police and deputy commissioner, to fix a date within a week to enable him meet the Speaker and bring him back the same day.
Surin had last month sent his resignation letter vacating his Torpa seat for Soren to contest a bypoll from there, but had withdrawn it after the JMM-LP asked him to do so.
A Lok Sabha member, the chief minister has to enter the assembly within June 30.