Phelps has qualified for three individual events at the world championships but does not need to participate to earn a spot on the 2016 U.S. Olympic team.
In December, Phelps pleaded guilty to the DUI charge — his second in 10 years — in a Baltimore court. He received a one-year suspended sentence and 18 months of supervised probation, which is still in effect.
Phelps took part in a rehab program after his arrest and suspension. He also got engaged to his longtime girlfriend.