"FIFA Doping Control Officers arrived in the base camp in Novogorsk. We'll pass all the tests quickly and continue preparing for the very important match against Spain," the post read.

Russia finished second in their group and advanced to the knockout stage of the World Cup for the first time in history. The host nation will face Group B winners Spain at Moscow’s Luzhniki Stadium on Sunday.

The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the matches being played in 11 cities across Russia.