Former American track coach Alberto Salazar’s four-year suspension has been upheld by the Court of Arbitration for Sport (CAS).
The 63-year-old was banned two years ago for a series of doping violations by the US Anti-Doping Agency (USADA) but appealed against the decision.
Salazar ran the Nike Oregon Project , based in Beaverton, Oregon.
It was established in 2001 and was the home of British four-time Olympic champion Mo Farah.
Farah has not been accused of doping, and left the Oregon Project in 2017.
A BBC Panorama film revealed last year that Farah was questioned about his relationship with Salazar by US investigators in 2015, but he has never failed a doping test, nor been accused of doping. Salazar also coached Dutch runner Sifan Hassan, who took triple medals at the just concluded Tokyo 2020 in the 1500m, 5000m and 10,000m. It eventually resulted in bans for both Salazar and Nike endocrinologist Dr Geoffrey Brown, announced in October 2019.
Before he became a coach, Salazar was one of the most talented distance runners of his generation, winning the New York City marathon in 1980, 1981 and 1982. He is also famous for the ‘Duel in the Sun’ at the Boston Marathon in 1982.