Koirala, recently elected leader of the Nepali Congress Parliamentary Party, told PTI that negotiations are already underway with other parties on government formation.
Speaking on the sidelines of a function organised here by the party to felicitate newly elected members of the Constituent Assembly, he said: "We are trying our best to form a consensus government and most of the political parties, with whom I have talked, are in favour of the idea."
"We will wait till February 2 to form the consensus government," Koirala said. "We are holding talks with other political parties, which I think are moving in a positive direction."
The President set the deadline according to the provisions of the interim Constitution.
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The Nepali Congress, with 194 lawmakers, is the largest party in the new 601-member assembly that will draft a constitution aimed at ending years of political unrest.
It is in negotiations with 30 parties, including CPN-UML, the second largest party in the Constituent Assembly, and UCPN-Maoist, the third largest party.
Koirala said his party accords top priority to the timely drafting of the new Constitution.
"It is our priority to draft the Constitution on time and I am confident of coming up with a new Constitution within a year, as mandated by the people," he said.
Koirala is likely to be the next prime minister following his election as leader of the Nepali Congress Parliamentary Party last week.