"Both will share the dais and address election rallies seeking support for candidates of the JD-U, RJD and Congress," Bihar Parliamentary Affairs Minister Shravan Kumar said.
Sharvan, a senior JD-U leader consider close to Nitish Kumar, said the Congress, Janata Dal-United and Rashtriya Janata Dal considered the Bharatiya Janata Party (BJP) as their main rival in Jharkhand.
The Jharkhand election will take place in November-December.
In August, Lalu Prasad and Nitish Kumar jointly campaigned during the by-elections in Bihar. The JD-U, RJD and Congress won six of the 10 assembly seats.
That was the first time the two leaders came together after a gap of 20 years.