"The Russian Football Union has been notified by FIFA about the opening of disciplinary cases related to a possible violation of anti-doping rules in 2013 by two male football players and one female football player. These players have not been called up to national teams," the Russian Football Union said in a statement.
"All the necessary information has been communicated to these persons, and the Russian Football Union will provide them with all the necessary legal assistance," the union added.
The Russian Football Union also assured it is in contact with FIFA on the matter.