Japanese ski jumper Ryoyu Kobayashi has tested positive for coronavirus, he revealed on his Twitter account Sunday.

The news comes a day after the 25-year-old Kobayashi became the first Japanese man to win 20 ski jumping World Cup competitions with a victory in the new season's third individual event in Ruka, Finland.

Japanese ski jumper Ryoyu Kobayashi celebrates after picking up his first World Cup win of the season at an event in Ruka, Finland, on Nov. 27, 2021. (Kyodo)

According to the International Ski Federation, one member of Japan's team who was tested Saturday returned a positive result. Although the athlete is said to be asymptomatic, he has been isolated.

On his Twitter account, Kobayashi posted he had been infected with the coronavirus in June and he has been fully vaccinated.

Related coverage:

Ski jumping: Ryoyu Kobayashi becomes 1st Japanese man to win 20 World Cups

Japan's skiing, snowboarding hopefuls promise big Beijing outings