The Athletics Integrity Unit (AIU) is to investigate allegations that two Belarus coaches tried to force sprinter Krystsina Tsimanouskaya to board a flight home from the Tokyo Olympics.
Tsimanouskaya claimed Artur Shimak and Yury Maisevich took her to the airport against her will after she criticised the coaches on social media.
The 24-year-old finished fourth in her 100 metres heat, before being pulled out of the Games by Belarusian officials.
Due to also compete in the 200m, she claimed a Belarusian coach entered her for the 4x400m relay despite her never having raced in the event before.
Tsimanouskaya said she did not feel safe returning to her homeland amid a crackdown on anti-government dissent following mass protests that erupted last year over a disputed election.
She flew to Warsaw rather than Belarus after being granted a humanitarian visa by Poland.
The International Olympic Committee (IOC) revoked Shimak and Maisevichas' accreditation in August after launching an investigation into the saga.
The IOC and World Athletics on Thursday revealed that the AIU will look into the matter.
World Athletics and the IOC stated: "Further to the incident involving Belarusian athlete Krystsina Tsimanouskaya at the Olympic Games Tokyo 2020 and the decision taken by the IOC to cancel and remove the accreditations of the two coaches, Messrs A. Shimak and Y. Maisevich, as a provisional measure during the Games, the IOC and World Athletics have jointly agreed to continue the investigation and to open a formal procedure vis-à-vis the two aforementioned coaches.
"To this effect, and given that the Olympic Games have now concluded, it has been decided that the Athletics Integrity Unit (AIU) – the independent body created by World Athletics to manage all integrity issues (both doping-related and non-doping-related) for the sport of athletics – will conduct the procedure, with the full collaboration and support of the IOC.
"The AIU will publish the outcome of its investigation when this has been finalised."