Singh led the Congress to victory in the northern state after a decade.
Inducted into the Congress by Rajiv Gandhi and first elected to the Lok Sabha in 1980, Capt. Amarinder Singh had been campaigning to mark the first state-election victory for the grand old party after the 2014 Lok Sabha debacle.
Singh contested on the Patiala (Urban) seat. The assembly segment has been represented by him on three consecutive occasions, from 2002 to 2014.
Governor VP Singh Badnore will administer the oath of office and secrecy to Singh at Raj Bhawan in Chandigarh.
Navjot Sidhu, Manpreet Badal, Charanjit Channi are among the other Congress MLAs who would be taking oath as ministers today as well.
The Shiromani Akali Dal (SAD)-Bharatiya Janata Party (BJP) alliance fared the worst with 18 seats.
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