Even Shreyas Iyer, who has been picked in the Indian side for the ODI series against Sri Lanka, has not been included in the squad.
The squad, to be led by Aditya Tare, includes their in-form young batsman Prithvi Shaw and opener Jay Bista.
A senior Mumbai Cricket Association official today told PTI that Thakur has been advised rest and hence was not considered for selection.
Other regulars - Akhil Herwadkar, Siddesh Lad, Surya Kumar Yadav, senior pro Dhawal Kulkarni, medium pacer Akash Parkar and left-arm spinner Karsh Kothari - have all been named in the squad.
The domestic cricket powerhouse stormed into the quarterfinals after a comprehensive win over Tripura.
The 41-time Ranji Trophy champions will lock horns with Karnakata in Nagpur for a place in the semifinals.
Squad: Aditya Tare (Captain), Surya Kumar Yadav (Vice Captain), Dhawal Kulkarni, Siddhesh Lad, Jay Bista, Prithvi Shaw, Akhil Herwadkar, Sufiyan Shaikh, Akash Parkar, Karsh Kothari, Sagar Trivedi, Vijay Gohil, Shivam Malhotra, Shivam Dube and Shubham Ranjane.
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