Japanese speed skater Kei Saito has become the first athlete to be excluded from the 2018 Winter Olympics for a doping violation.
Saito failed an out-of-competition doping test prior to the Games, the Court of Arbitration for Sport said.
The 21-year-old has left the athletes’ Olympic Village voluntarily but insists he is innocent.
He tested positive for acetalozamide, a banned diuretic which is considered a masking agent.
Masking agents are often used to cover up banned performance-enhancing substances.
The 21-year-old had not yet competed in the Games but was due to compete in the men’s 5,000m relay on Tuesday.
The CAS statement said he was provisionally suspended from the Olympics and other competitions pending a full investigation.
“I am shocked by this as I have never tried to commit doping,” Saito said in a statement.
“I have been trained in anti-doping. I have never taken a steroid so there is no need for me to mask something, and I never had to drop weight by using this medicine.
“So I have no motivation to use this. I want to prove my innocence but I do not want to burden my team so I accepted this decision,” he said.
Winter Olympics: Japan’s Kei Saito given first doping ban in Pyeongchang