Denis Cheryshev has been cleared of an alleged doping offence by the Spanish Anti-Doping Agency (AEPSAD) following an investigation.
Cheryshev was investigated after his father indicated in an interview his son had used growth hormone treatment, which the player later denied.
The 27-year-old was one of the stars of the World Cup, scoring four goals as hosts Russia surprisingly reached the quarter-finals before losing to Croatia.
Cheryshev shared a letter, purportedly from AEPSAD, on social media on Thursday saying the investigation has been archived due to a lack of evidence showing any "irregular conduct" on the player's behalf.
AEPSAD later confirmed to Omnisport that the case had indeed been closed and the World Anti-Doping Agency (WADA) and Russian Anti-Doping Agency (RUSADA) had been informed.
Cheryshev has made two LaLiga appearances for Valencia this season after joining the club from fellow LaLiga side Villarreal on loan.