Russia's football league is launching an investigation after a banana was thrown at Roberto Carlos during a league match on Wednesday, local media reported, the second such racist taunt to be faced by the former World Cup winner in three months.

The Brazilian, who joined Anzhi Makhachkala earlier this year, quit the pitch in protest before the final whistle after the banana was thrown from the stands in stoppage time of a game at Krylya Sovetov.

Krylya Sovetov will also begin its own enquiry into the incident, the website of Russian daily Sport Express said.

''A banana thrown on the field left an impression as lingering as the joy of our victory,'' Anzhi coach Gadzhi Gadzhiyev was quoted as tellihng the paper. ''One cannot remain indifferent about a prank like this.''

In March, Russian champion Zenit St. Petersburg was fined $10,000 after one of its fans offered a banana to Roberto Carlos at a pre-match ceremony.

The 38-year-old left wingback, who won the World Cup in 2002, joined the Russian club earlier this year from Corinthians.