Besides top Congress leaders, Trinamool Congress chief Mamata Banerjee is also likely to attend the meeting along with other senior leaders like Mayawati, Akhilesh Yadav and Sitaram Yechury.

Since Sharad Yadav is in Bihar, he may be represented by Ali Anwar Ansari.

Apart from the Congress, Left parties, TMC, RJD, NCP, JMM, DMK, NC, SP, BSP, RLD, JD-S, Kerala Congress, AIUDF besides some others are slated to participate in the meeting.

The 18 opposition parties had earlier decided to meet once a month to discuss various crucial issues and maintain better coordination among themselves to 'unitedly' take on the government.

West Bengal Chief Minister Mamata Banerjee met senior Congress leader Ahmed Patel ahead of the opposition meeting tomorrow.

The Trinamool chief also met President Ram Nath Kovind which was described by her party officials as a "courtesy" call.