The United People's Freedom Alliance (UPFA) and Pivithuru Hela Urumaya are holding talks to form a common alliance.
Top figures of the two sides have met for a preliminary discussion.
For the UPFA, participants were general secretary Thilanga Sumathipala, Dayasiri Jayasekara and former Kotte mayor Janaka Ranawaka.
Leader Udaya Gammanpila, national organizer Dhammika Ratmale, acting general secretary Nalaka Perera, Prasanna Amaratunga, Thilina Peiris, Bhupati Kahatuduwa, Shirantha Jayalath and Anjana Udara represented the PHU.
Leaders of the two parties stressed that they would discuss forming an extensive alliance against the repressive policies of the present regime.