The Russian Olympic Committee has said 14 of its athletes at the 2008 Beijing Olympics tested positive for doping during re-tests of their samples.
Sports minister Vitaly Mutko said the news of the positive tests “certainly doesn’t look good”.
Country’s athletes are currently banned from international competition.
In a statement (in Russian), it said it had received the information in “official documents” from the International Olympic Committee (IOC).
The IOC earlier said up to 31 athletes could be banned from the Rio Games.
The Russian Athletics Federation said any athlete found to have used doping in previous years would not go to Rio.
