"We see no grounds for a revision of the corridor," Alexei Ulyukayev, the Central Bank first deputy chairman, said on Ekho Moskvy radio.
The dollar/euro basket is a key determiner of the ruble's exchange rate against the dollar and the euro. Its widening would result in a drop in the value of the ruble against these two currencies.
Ulyukayev also told the radio station that capital inflow to Russia for the first nine months of 2008 was around $800 million.
"This is a provisional figure," he said. "We shall confirm it in a month, when it is possible the inflow-outflow balance will be zero."
Ulyukayev said capital outflow in August was about $7 billion, followed by about $25 billion in September. He expected the figure for October to be lower than the previous month.
The Central Bank has warned that if capital outflow continues then the balance of payments is likely to weaken.
Billions of dollars have been pulled out of Russia by international investors since the global credit crisis hit in August, while lower oil prices have also reduced the flow of capital into the country.
