Besides Adityanath, his deputies Keshav Prasad Maurya and Dinesh Sharma, two more state ministers had filed their nomination papers yesterday.
There are five vacancies in the Upper House of the state and with no other candidate in the fray, they are all set to be elected unopposed.
"The nomination papers of Yogi Adityanath, Keshav Prasad Maurya, Dinesh Sharma and Swatantra Dev Singh were found valid during scrutiny today," principal secretary UP Vidhan Sabha Pradeep Dubey, who is also the returning officer, said.
Of the five seats for which by-polls will be held, four were vacated by SP MLCs Buqqal Nawab, Yashwant, Sarojini Agarwal and Ashok Bajpai. The fifth fell vacant when Jaiveer Singh resigned from the BSP and joined the BJP.
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Adityanath, who took over as the CM on March 19, has to become a legislator within the stipulated six months of assuming office. The deadline expires on September 19.
Similarly, Maurya, Sharma, Raza and Singh are not members of either of the two Houses of the state legislature.
Adityanath and Maurya are presently members of the Lok Sabha.
Adityanath will become the third successive chief minister after Akhilesh Yadav (SP) and Mayawati (BSP) to adopt the Upper House route.