Sechin declined to comment on the details.
"This is one of the elements of the deal," he said when asked about the $60 billion component.
Analysts said the possible upfront payment from China would be a big positive for indebted Rosneft.
"If confirmed, this would be a transformational event for the company's balance sheet: Rosneft could even potentially be able to show a net cash position, though working capital would be negative. The prepayment could minimize financing risks for the leveraged state-controlled oil company," J.P. Morgan analysts said in a note.
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Traders' Role Grows
According to Standard and Poor's, Rosneft faces large debt maturities in 2013, 2014, and 2015 of $6.6 billion, $15.9 billon, and $16.2 billion, respectively.
Prepayment from China would allow Rosneft to lighten the burden on its balance sheet by reducing debts to banks.
The company has also used other schemes to reduce its debt, including receiving $10 billion from Glencore and Vitol, the world's two largest oil trading houses, in exchange for five years of supplies.
The money was borrowed by the traders for Rosneft and gave the two Swiss trading houses unprecedented access to Russian crude supplies in Europe.
On Friday, Swiss trading house Trafigura, the world's third largest, agreed to a similar deal by pre-paying Rosneft $1.5 billion for receiving 10 million tonnes over 5 years.
Separately, Rosneft clinched a $7 billion deal with Polish refiner PKN Orlen PKN.WA to deliver 8 million tonnes of crude oil to the Czech Republic via the Druzhba pipeline.
It also signed a preliminary deal with Vitol to sell liquefied natural gas (LNG) from a Rosneft's planned plant in eastern Russia from 2019.