The announcement was made by Union minister Arun Jaitley, the party's central observer, after a meeting of state BJP legislature party here.
"A proposal to elect Rupani as leader of state BJP legislature party and Patel as deputy leader of state legislature party has been adopted," Jaitley told a press conference. Patel is the incumbent deputy chief minister.
Though the BJP retained power in the key western state for a record sixth straight term, there was speculation about Rupani's continuance due to the party's narrow victory over challenger Congress.
Rupani's proximity to the top party leadership, his clean and caste neutral image apparently tilted the scales in his favour.
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Jaitley said the central observers, including BJP general secretary Saroj Pandey, asked the MLAs for names for the post of the leader and deputy leader of the legislature party, and one of them--Bhupendra Sinh Chudasama-- suggested Rupani and Patel for the posts. Five others backed Chudasama's proposal.
Asked why was there the suspense over who would be the next chief minister, Jaitley said, it was a media creation.
He said Rupani will hold consultations with elected MLAs before forming the new government. Rupani, he said, will meet Governor O P Kohli and finalise the date for the swearing-in.