Samajwadi Party leader Mulayam Singh Yadav met Congress president Sonia Gandhi in New Delhi on Sunday evening.
The meeting was important, as it took place close on the heels of a split in the Congress Legislature Party in Uttar Pradesh.
Sixteen Congress legislators from UP will call on Gandhi on Monday along with Pradesh Congress Committee president Arun Kumar Munna and CLP leader Pramod Tiwari.
The Congress MLAs, who arrived in New Delhi on Sunday, met All India Congress Committee general secretary Motilal Vora, who ruled out any change in party leadership in UP.
There was no official word on whether Yadav sought Gandhi's support to help his party topple the Mayawati government in UP.
In the past the Congress had cold-shouldered such overtures from the SP chief, leading to bad blood between the two parties.