Six athletes and seven officials from Italy's Olympic delegation are being quarantined at the Tokyo 2020 Village.
It's after coming into "close contact" with a journalist who tested positive to COVID-19 on their flight to the Games.
Japanese health authorities made the decision to quarantine the 13 individuals but the athletes will still be allowed to train and compete at the Games, the news agency said. The names of the six athletes, competing in boxing, diving and skateboarding, have not been disclosed.
Italy's Sports Undersecretary Valentina Vezzali was quoted by AGI as saying that the athletes were following all the required procedures.
"I am sure that the head of our delegation will manage to keep everything under control, deal with the situation in the best way, and that our athletes will be able to take part in the competitions," she said.


Man City drop points in chase of Arsenal, Liverpool and Man Utd also draw
Desert Vipers seal first DP World ILT20 crown after victory over MI Emirates
Cameroon through to take on Morocco in Cup of Nations
Bangladesh will not play T20 World Cup matches in India over 'players' safety'
Root-Brook stand lifts England before weather intervenes in final Ashes Test