Cristiano Ronaldo underwent two doping tests within 72 hours by the Saudi Doping Control Committee, according to the source account.
The testing underscored scrutiny of one of the Saudi Professional League’s most high-profile players.
Ronaldo, 41, has scored 25 goals in the Saudi Pro League this season.
The Portugal forward remains a central figure for Al Nassr and one of the league’s standout performers.
The source account said his continued scoring output at this stage of his career has kept attention on his performances in Saudi Arabia.