FIFA are investigating Russia’s 23-man 2014 World Cup squad for doping offences.
It is reported their names are on a list of more than 1,000 “people of interest”.
The world governing body wants to establish whether the footballers were part of Russia’s state-sponsored doping programme, which has affected athletics, swimming and weightlifting.
It casts another shadow over Russia, next year’s World Cup hosts, along with hooligan and racism issues.
Russia failed to win a game at the 2014 World Cup, drawing with South Korea and Algeria and losing to Belgium.
They were knocked out in the group stage in Brazil and Fabio Capello was later sacked as manager.
Russia were eliminated from this year’s Confederations Cup after a 2-1 defeat by Mexico on Saturday.
The tournament hosts finished third in Group A with just one win from three games against New Zealand.
The Russian side were beaten by Portugal and Mexico, who both advance to the semi-final stage.
Russia will host the 2018 World Cup, which takes place across 12 venues beginning on June 14.