Along with Rupani and his deputy Nitin Patel, several others are also expected to be sworn-in by Governor O P Kohli.
Prime minister Modi, BJP president Amit Shah, chief ministers of all BJP-ruled states and those governed by NDA allies are expected to attend the ceremony, Gujarat BJP chief Jitu Vaghani said.
He said several Union ministers and senior leaders of the party have also been invited, besides saints and religious leaders of different faiths, Vaghani said.
"Most of the senior leaders who were ministers in the last government are expected to make it to the ministry," sources said.
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The names doing the rounds for Cabinet berths are Bhupendrasinh Chudasama, Kaushik Patel, Ganpat Vasava, Dilip Thakor, Babubhai Bokhiria and Pradeepsinh Jadeja.
Some new faces are likely to be inducted as ministers of state.
Six ministers in the previous government lost in the elections. Assembly Speaker Ramanlal Vora too bit the dust.
With 99 MLAs, the BJP has a simple majority in the 182- member Assembly, 16 less than its 2012 tally of 115.
Rupani and Patel were elected as the leader and deputy leader, respectively, of the BJP legislature party at its meeting on December 22.