Michael Phelps' date for trial on a drunken driving charge and related traffic offenses has been postponed for a month, to Dec. 19 in Baltimore District Court.
His defense attorney, Steven A. Allen, told ESPN.com that he requested the postponement in order to allow Phelps to complete a six-week residential treatment program.
Phelps, the most decorated Olympian in history with 22 medals, was arrested in the early morning hours of Sept. 30 after Maryland Transportation Authority police clocked him driving 84 mph in a 45 mph zone and observed him crossing double lane lines near the Fort McHenry Tunnel in Baltimore.
Police said his blood alcohol level was .14 percent, well above the legal limit of .08 percent, and he failed field sobriety tests.
Phelps issued a statement of apology later the same day.
The 29-year-old came out of retirement earlier this year to train for the 2016 Rio de Janeiro Games. Following his arrest, USA Swimming, the sport's national governing body, suspended him for six months, cut off his stipend for the same period and withdrew him from the team that will compete in next year's world championships.
This is the second time Phelps has faced DUI charges in his home state. He pleaded guilty to a 2004 drunken driving offense on the Eastern Shore of Maryland and was sentenced to 18 months probation, a $250 fine and community service.