Citigroup, Credit Suisse First Boston, Goldman Sachs Group and Morgan Stanley were asked to help raise the rest by this week, signaling Russia's biggest acquisition may be days away, the bankers said.
Gazprom is closing in on an acquisition that will give the government control of 30 percent of the crude oil pumped in Russia, the world's second-largest supplier.
"Gazprom is pushing aggressively and putting all its ducks in a row to get Sibneft," said Chris Weafer, head of strategy at Alfa Bank.
Sibneft spokesman John Mann declined to comment in a telephone interview from Omsk, where the company is holding 10th anniversary celebrations.
Sibneft shareholders last week eased the way for a takeover by rejecting a proposal to force any company buying more than 30 percent of Sibneft to make an offer to buy the rest.




