Top-flight strugglers Torpedo Moscow could be punished for the second time in three months for "racist behavior" by their supporters.
Some fans were heard making racial taunts in the 2-1 home win over Rostov in the Russian Premier League on Saturday, the Sport Express newspaper reported.
"We are looking into claims Torpedo fans were heard making monkey chants that were supposedly addressed at Rostov's dark-skinned players," said Artur Grigoryants, head of the Russian Football Union's disciplinary committee.
"These facts have yet to be confirmed in either the match delegate's or the match inspector's reports. We will be speaking to representatives of the clubs and studying video footage."
Torpedo, which is third from bottom, was also ordered in September to close part of its stadium for racist chants directed at Dynamo Moscow defender Christopher Samba.
Second from bottom Rostov was without coach Igor Gamula on Saturday. He was banned this month for five league matches after making racial comments to a journalist.