The whip was issued by chief whip Ram Niwas Rawat. It also directed the party MLAs to show the ballot to the party's authorised agent before casting it.
Congress has 57 MLAs in the state and is short of one vote to ensure the victory of its candidate.
BSP has four MLAs and has already issued a whip to its legislators to vote for the Congress candidate.
In the 230-member Assembly, the ruling BJP has 166 members followed by Congress (57), BSP (4) and Independents (3).
AICC general secretary and in-charge of Madhya Pradesh Mohan Prakash too has reached here. Both will remain here till the completion of voting on June 11, party sources said.