Ryan became the first Irish swimmer to compete in three Olympic Games

Irish Olympic swimmer Shane Ryan has joined the Enhanced Games, a multi-sport competition that will allow athletes to use performance-enhancing substances without being subject to drug tests.

Ryan, who was born in the USA, competed in three successive Olympics Games for Ireland before announcing his retirement from the sport earlier this month.

"After a decade dedicated to traditional competition on the world's highest stage, I'm excited to dive into this next chapter with the Enhanced Games," the 31-year-old said on his decision.

Ryan joins Team GB Olympic swimmer Ben Proud, four-time Greece Olympian Kristian Gkolomeev and US sprinter Fred Kerley in announcing his intentions to compete at the Games.