While he is yet to decide on his cabinet members, Congress sources said his ministers would be announced over the next two days.
The Congress won 42 of the 60 Assembly seats in the just-concluded elections, marking the first time that a single party has received an absolute majority in the state.
While the Congress was the single largest party in the last term, it had formed a coalition government with the CPI. The CPI pulled out of the alliance two days before the election results was announced, and decided to support the rainbow alliance of all non-Congress parties.
The victory gave the edge to Ibobi Singh, although his rival within the party, Y Erabot Singh, is known to be close to the Nehru-Gandhi family.