"I suppose that I will be asked to begin the formation of a new coalition government at today's party leadership meeting. I am ready for this," Donald Tusk said.
He said negotiations will begin on Wednesday with the chairman of the Polish Peasant Party, Waldemar Pawlak.
Poland's State Electoral Commission is expected to announce the final results of early parliamentary elections, which took place on October 21, within the next few hours.
According to preliminary results, the center-right opposition party Civic Platform has 41 percent of the vote, giving it a resounding victory over the conservative prime minister's ruling Law and Justice Party, with 32 percent. Accordingly, Civic Platform will have 209 seats in the 460-seat lower house, which is not enough for an absolute majority. It could, however, form a government by teaming up with the Polish Peasant Party, which won 31 seats. Prime Minister Kaczynski's Law and Justice won 166 seats.
Bogdan Zdrojewski, leader of the Civic Platform parliamentary faction, said coalition talks will last through November 10, when the party council is to make a final decision.