"I have postponed it due to Assembly session beginning this Monday. The portfolio change with new minister coming in will be done in January," Gogoi told reporters here.
Without dropping any hint, he said some existing ministers will be dropped during the reshuffle.
When asked if the Congress high command has approved it, Gogoi said, "I have not given any list to high command yet."
The Chief Minister said many angles have to be considered before inducting a new minister.
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Gogoi also informed the Police Commissionerate system for Guwahati City will be introduced from January and it will follow the Bhubaneswar model.
Talking about the Central government, the Chief Minister said people of Assam voted for BJP during Lok Sabha elections with lots of hopes, but the party has "cheated" them.
"NDA is totally exposed. They showed one face before elections and is now showing another face. They are doing big injustice to Assam and cutting all benefits to the state. People expected new schemes, but they are withdrawing all old benefits introduced during UPA tenure," he added.
"There is no sign of 'achche din' (good days) for Assam. It is all 'kharab din' (bad days) for the state," he added.