Japanese short track speed skater Kei Saito failed an out-of-competition doping test on the day of his arrival in Pyeongchang and has been expelled from the Winter Olympics, Japan team officials said on Tuesday.
He is the first Japanese athlete to ever test positive for doping at a Winter Olympics.
However, it works also as a masking agent that can hide or make it harder to detect the presence of performance-enhancing drugs.
The skater himself has not commented on the situation, nor has the World Anti-Doping Agency (WADA).
A statement released by The Court of Arbitration for Sport on Tuesday said that the speedskater had "accepted on a voluntary basis to be provisionally suspended and to leave the Olympic Village". "I still can not fathom how his test results came back positive".
"I have been trained in anti-doping".
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"I am shocked by this as I have never tried to commit doping", he said. "I have no merit and motivation for using this drug. The only way this substance could have entered my system is that I took it unknowingly and happened by accident".
The New York Times' Juliet Macur reported that Saito tested positive for a masking agent and had left the Olympic village.
CAS said final decisions may be appealed only after the Winter Games come to a conclusion.
Japan's short track coach said he is "surprised and dismayed" over the test results. He too is shocked. He is barred from competing at the Olympics and any other International Skating Union events "pending the resolution of this matter", it said.
The International Olympic Committee (IOC) banned Russian Federation from Pyeongchang after a massive doping scandal during the Sochi Games. Read up on Metro's OAR guide for all the rules and regulations these athletes have to follow.
However Saito, who had been due to compete in the second heat of the men's 5,000m relay on Wednesday, vowed to "fight" any potential sanction after leaving the Olympic village.