Mr Sai is close to former Chief Minister Raman Singh, who served from 2003 to 2018.
The new Chief Minister’s political journey started from the post of a sarpanch.
Mr Sai had been an MLA from 1990 to 1998. He was elected from Raigarh constituency in the 1999 Lok Sabha election.
He became Chhattisgarh BJP chief in 2006, and a Union Minister of State in the centre.
Mr Sai is considered close to the Rashtriya Swayamsevak Sangh (RSS), the ideological mentor of the BJP.