The negotiations are due to start at 4.00 pm at the Ankara Hotel, stated the state Privatization Administration (OIB).
A previous $1.3 billion sale attempt of the firm failed last year as labour unions legally challenged it.
Groups said to join the tender are:
PKN Orlen-Zorlu: Polski Koncern Naftowy Orlen SA and Turkey's Zorlu Holding A.S.
Shell-Koc group: The Shell Company of Turkey Ltd. Opet Petrolculuk A.S. Aygaz A.S. Shell Overseas Inv. B.V. (9.9 percent), Koc Holding A.S.
Indian Oil Corp-Calik Enerji group: Indian Oil Corporation Ltd. Calik Enerji ve Sanayi Ticaret A.S.
Anadolu group: Anadolu Uluslararasi Ticaret ve Tasimacilik A.S. Cukurova Holding A.S.
Petrol Ofisi-TAC group: Tupras Acquisition Consortium, Petrol Ofisi A.S.