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.

The move has been criticised by Sport Ireland, which says it is “deeply disappointed” with the decision.

The first Enhanced Games are due to take place in Las Vegas in 2026 with each event awarded a total prize purse of $500,000 and a $1m on offer for competitors who break world records.

Swim Ireland has also condemned the move, confirming his disassociation with the organisation and that he will no longer be provided with any funding or services.

Ryan competed at the Rio 2016, Tokyo 2020 and Paris 2024 Games, becoming the first Irish swimmer to participate at three Olympics.

The Olympic Federation of Ireland said that Ryan’s move to the Enhanced Games “stands in direct opposition to our core clean sport values”.