ODM leader Raila Odinga, Kanu chair Gideon Moi and his Wiper counterpart Kalonzo Musyoka today attended the National Delegates Conference of the United Democratic Party.
The UDP party led by former Cabinet Minister and Lugari MP Cyrus Jirongo is a member of the One Kenya Alliance.
The NDC was held at the Multi-Media University.
Delegates of the Jirongo-led party are set to ratify a host of several decisions made by the party's executive leadership.
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The attendance of the ODM leader signals a looming major alliance between OKA and Azimio La Umoja led by Raila.
The partnership will see the team face off with Kenya Kwanza Alliance led by Deputy President William Ruto.
This comes in the wake of talks and rumours that Kalonzo is set to lead OKA into the Azimio la Umoja team after being persuaded by President Uhuru Kenyatta.
Kenyatta on Wednesday officially endorsed the ODM leader Raila Odinga's presidential bid.
Other OKA parties have already held their NDC and their party leaders were endorsed to vie for the presidency.
All other OKA parties have already held their NDCs and endorsed their leaders for the top seat.