Prospective purchasers include the Korea National Oil Corporation and possibly Thailand upstream company PTTEP, which is said to have its eye on the offshore north-west Java concession. The bids are due in next Friday, said one source on condition of anonymity. The deadline was put back by two weeks, he added without elaboration. KNOC will not be bidding in partnership with the PTTEP, a Seoul source said, pouring cold water on a report in Bangkok Thai language business news service Krungthep Turakij.