"There are discussions going on. I cannot comment anything further," said a source close to the Russian giant.
Last year, Rosneft had signed an initial deal to supply 10 million tonnes a year or 200,000 barrels per day (bpd) of oil to Essar Group over 10-years.
There are negotiations on signing a firm term sheet for beginning of supplies, another source said.
At the time of signing crude deal, Russian bank VTB had inked a deal to open a USD 1 billion credit line to Essar.
Industry sources said Essar may be expecting a valuation of up to USD 8 billion of the company.
Essar Oil operates a 20 million tons a year refinery at Vadinar and also has 1,600 petrol pumps in the country. It also has five coal-bed methane (CBM), holding up to 10 Trillion cubic feet of gas resource.
When contacted, an Essar spokesperson said: "It is not our policy to comment on market speculations.
"The company has already informed the Stock Exchanges last week stating that there is no event or development which is required to be submitted to the stock exchanges as per the listing agreement."
Rosneft is majority owned by the Russian government with BP Plc holding under a 20 per cent stake and public shareholders around 10 per cent.
Essar Oil Ltd shares hit a five-year high, with the stock hitting an upper circuit of 10% on the back of higher volumes.
Its share touched an intra-day high of Rs 153.80, a level last seen on 11 November 2010, before closing at Rs 146.45 on the BSE.
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