Former Haryana Chief Minister Bhupinder Singh Hooda was appointed as the leader of Congress Legislature Party (CLP) in the state.
AICC general secretary for Haryana Ghulam Nabi Azad made the announcement on Saturday.
With the appointment, Hooda will be the Leader of Opposition in the newly-constituted assembly, Azad said.
Congress president Sonia Gandhi picked Hooda after the newly elected MLAs on Friday failed to reach a consensus.
Ahead of the Assembly election in Haryana, the Congress high command had replaced Ashok Tanwar with Selja as the state party chief and Hooda had replaced Choudhary as the CLP leader.
In the 90-member assembly, the Congress has 31 MLAs, the strength of BJP is 40, its ally Jannayak Janta Party (JJP) 10 and others have registered 9.