On Saturday, as many as 25 ministers will take oath in the Karnataka cabinet expansion, according to ndtv.com.
The Chief Minister will meet Rahul Gandhi on Friday for a sign-off.
Siddaramaiah and President DK Shivakumar took oath as Chief Minister and Deputy Chief Minister on May 20.
Eight MLAs including Mallikarjun Kharge's son Priyank Kharge also took oath along with them for ministerial posts.
Drawing up of minister's list of portfolios will not be an easy job for considering the need to balance and represent various communities.
In absence of any Lingayat Chief Minister, there is speculation that one chunk of ministerial berths will go to MLAs from the community.
Karnataka sends 28 MPs to the Lok Sabha, which makes it a major battleground state and of national importance.
Since general elections are due next year, Congress is also under pressure to show quick results and deliver on the promises it made to the people of Karnataka before the elections.
Priyank Kharge made it clear that the new Congress government intends to review policies of BJP government and "set it right". This raised speculations that decisions on the Muslim quota, hijab ban and the anti-conversion law are due for a rollback.