In the build up to one of Russia's biggest games in recent history - a last-16 World Cup tie with Spain - the spotlight has been on surprise star Denis Cheryshev, rather than their shock run to the knockout rounds.
Cheryshev has been forced to deny that he used banned substances prior to the World Cup after his own father was reported as saying he had been injected with 'growth hormones'.
The punishment for using a growth hormone without medical exemption is a ban of up to four years and Cheryshev is now at the centre of the Russian doping saga that continues to rumble on.
Russia's shock World Cup star Denis Cheryshev denies taking 'growth hormones' after claims
The 27-year-old has refuted the words attributed to his father, Dimitri Cherysev, saying: 'I don't know where the journalist got this from. Maybe they didn't understand my father; maybe they didn't understand what was going on. I have never used any prohibited substances.'
It is not ideal preparation for the midfielder ahead of such a big game. Russia will look to him to continue his fine, if unexpected, form at the World Cup, which has seen him score three goals so far.
Cheryshev is the only member of the squad who plays overseas and is currently with Villarreal, where he has been blighted with injuries to the extent he had not played for his national team for two years.
Cheryshev was forced to deny doping after his father 'claimed' he had used 'growth hormones'
In the wake of those injuries, his father was quoted as having said: 'He received an injury and, because of the miscommunication of doctors, they began