Former US Olympic Swimmer Michael Phelps has said "if he feels like coming back, he could" leaving open the possibility of competing at the Rio 2016 Olympic Games.
The 18-time gold medal winner earlier this year had ruled out a comeback, but he suggested a possible change of plans by saying he was not aware what is going to happen in next three years, the China Daily reports.
Phelps' coach Bob Bowman confirmed that Phelps signed up for drug testing in May, allowing him to compete as early as March.
Phelps has a history of 22 medals, but he retired last year after winning four gold medals and two silvers at the London Games.