The ceremony will take place at 11 am.
"Vijay Rupani was chosen as Legislature party leader unanimously, Nitin Bhai Patel as the deputy Legislature party leader in a meeting today. Will inform you all about the swearing in, soon," Union Minister Arun Jaitley said while addressing the media in Gandhinagar.
Rupani supporters are celebrating outside the BJP office in Gujarat's Gandhinagar.
The BJP won the election for the 182-member Gujarat Assembly on Monday, claiming a clear majority of 99 seats.
The Congress Party trailed in second with 77 seats, followed by the Bharatiya Tribal Party (two) and NCP (one), while independent candidates won three seats.
Rupani secured a comfortable win from Rajkot West seat by 1,31,586 votes, which is the largest constituency in the Saurashtra region. (ANI)