Discussions are already underway with Pavitradevi Wanniarachchi, Lakshman Seneviratne and Manusha Nanayakkara, the sources said.
Minister Vijith Wijayamuni Soysa said four SLFP MPs have agreed to accept ministerial portfolios and serve the country.
Several more opposition MPs too, are at talks with the government, he said, adding that he was confident they would join the government early next year.