The sanction comes after the 31-year-old missed three drug tests between September 2022 and June 2023. Bosse had announced his retirement in December, seven months before the Paris 2024 Olympics. He had received notifications of breaches three times, with the period coinciding with his efforts to return to a high-level athletic performance despite grappling with a hamstring injury.

The initial breach occurred on 25 September 2022, when an anti-doping controller arrived at his residence to conduct a test within the athlete's scheduled time slot, but Bosse was not available. He told French news outlet L'Équipe: "I was one foot in training, one foot on holiday."

Bosse, who was eliminated at semi-final stage of the Tokyo Olympics, was enduring a thigh problem at the time. Following surgery in December 2022, Bosse embarked on a race against time with the aspiration of competing in his fourth Olympic Games in Paris.

On 1 May 2023, authorities tried to contact him again, but were unable to reach him during a time when he was with family in Nantes. "I wasn't worried at that time because I had forgotten the previous one and so I thought I only had one. At that moment, I gave up completely."

Then a month later, a controller returned to his residence for another scheduled check, but the athlete was evidently absent. He was subsequently informed a few weeks later of a likely two-year suspension for failing to fulfill such obligations. 

Despite feeling dejected and shocked, Bosse attempted to defend himself by attributing the second violation to an issue with the absence of a doorbell.

"I made three mistakes, I accept. It's true that I haven't always been the best student when it comes to taking care of my location but, until then, it had never played any tricks on me. I know I should have been more serious but I would like to point out that I have been in the AFLD target group since 2012 and they have all my analyses."

The 31-year-old was unable to recuperate following surgery on his right thigh last year and had been out of competition since April 2023.

Before his injury troubles he most notably secured fourth place in the 800m at the Rio Games back in 2016, and has yet to recapture the form that led to his crowning as the world champion over 800m in London in 2017. Bosse also got his hands on bronze at the European Championships in both 2012 and 2018.

Since leaving his beloved sport behind, the Frenchman has starred in two reality TV shows in his homeland and focussed on his association combining sport and ecology which he launched with his friend and former international team-mate Bryan Cantero.