Washington: Olympic swimming superstar Michael Phelps, who retired from the sport after taking six medals at the 2012 London Olympics, will make his competitive comeback next week at a US Grand Prix series event in Mesa, Arizona, USA Swimming announced Monday.

The 28-tear-old returned to the anti-doping test program last year and his coach, Bob Bowman, had hinted at a comeback, which could see the record 22-time Olympic medalist continue his career all the way to the 2016 Rio de Janeiro Olympics.