Vice President Kalonzo Musyoka now says his Wiper Democratic Movement, Raila Odinga's Orange Democratic Movement and Moses Wetangula's Ford Kenya will sign a pre-poll pact on Tuesday.
Musyoka who spoke in his Mwingi North constituency after registering as a voter on Monday said the agreement was for the parties to work together ahead of the 2013 General Election.
The statement by the VP came as his lieutenants and those of Odinga met in Nairobi to craft the agreement.
Among those at the meeting at Orengo's personal office at Lonrho House were Education Minister Mutula Kilonzo, David Musila, Johnson Muthama and Mohammed Affey.
Odinga's team at the six-hour talks was represented by Orengo, Anyang' Nyong'o, Dalmas Otieno and Musa Sirma.
Later, Cabinet Minister Charity Ngilu was seen emerging from the offices in the company of Mutito MP Kiema Kilonzo.
As they left, nominated MP Musikari Kombo was seen entering Orengo's office.