International Olympic Committee president Thomas Bach has described Alberto Salazar's ban as "very worrying" and has called on the World Anti-Doping Agency to look at athletes who worked with the disgraced American coach.
Salazar, who ran the Nike Oregon Project and worked with some of the world's leading distance runners, was given a four-year ban earlier this week for doping violations.
Speaking at a press conference, Bach said: "We have discussed the Salazar case, which is very worrying and raises serious concerns.
"We are confident that the WADA will look into this case very carefully and will follow up on questions which remain open. The IOC will write a letter to WADA in this respect."
Pressed on what questions the IOC would be asking, Bach said: "To see how many athletes have been investigated. Have all the athletes been investigated who have been training in this centre?
"Does the report address the whole period of the existence of this project or only part of it? Could any Olympic results directly or indirectly be affected?
"We learned from the report that the athletes would not have known what happened to them - this is an important factor when looking at sanctions but disqualification is mandatory whether the athlete knows or not.
"We are very confident that WADA is looking at this anyway so we are waiting for the advice from WADA in this respect."
Four-time Olympic gold medallist Mo Farah dominated distance running after joining Salazar before leaving the project in 2017.
He has never failed a doping test and has always denied any wrongdoing, while Salazar has said he will appeal.
The IOC, meanwhile, is to work with the International Testing Agency and WADA to develop a comprehensive plan for storing samples long term from the testing programme ahead of the 2020 Olympics in Tokyo.
Retesting of samples from previous Games has led to a significant number of athletes being stripped of medals.
Bach said: "For the Olympic Games, the IOC is storing samples for 10 years. Long-term storage of pre-Games samples can be an additional deterrent factor when combined with new testing methods."
