British boxer Amir Khan has been banned for two years after an anti-doping test revealed the presence of a prohibited substance following his fight against Kell Brook in February 2022.
Ednews reports citing Sport News tha the former light-welterweight world champion tested positive for ostarine.
Khan, who retired from boxing in May, accepted he broke anti-doping rules but said it was not intentional.
An independent tribunal accepted that argument, ruling out "deliberate or reckless conduct" by the 36-year-old.
The UK Anti-Doping (Ukad) website states ostarine is a drug designed to have similar effects to testosterone.
In October, British sprinter CJ Ujah was banned for 22 months after he tested positive for two banned substances, including ostarine, at the Tokyo Olympics.
"This case serves as a reminder that Ukad will diligently pursue anti-doping rule violations in order to protect clean sport," Ukad chief executive Jane Rumble said.
"Strict liability means athletes are ultimately responsible for what they ingest and for the presence of any prohibited substances in a sample."
The ban from all sport is deemed to have begun on 6 April 2022 and expires on 5 April 2024.
Fellow Briton Conor Benn failed two voluntary drug tests for the female fertility drug clomifene before his cancelled bout with Chris Eubank Jr in October.