A meeting of the party's Central Committee from Saturday comes days after top leaders of nine of these parties met here to announce their coming together for the upcoming general elections.
The crucial meeting would also discuss the broad contours of the CPI(M)'s manifesto for the elections, sources said.
Senior CPI(M) leader Sitaram Yechury said these nine parties together represented states having a total of 265 Lok Sabha MPs. The parties are AIADMK, SP, JD(U), JD(S), Jharkhand Vikas Morcha, CPI(M), CPI, RSP and Forward Bloc.
Apart from these 11 parties, People's Party of Punjab, Prakash Ambedkar's Republican Party in Maharashtra and "many other regional parties are expressing their intention to join such a coming together of secular opposition parties in the interests of building a better India," he said in an editorial in the forthcoming issue of CPI(M) organ 'People's Democracy'.
These parties are either ruling or are the main opposition from various major states that send an overwhelming majority of MPs to the Lok Sabha, he said.