USA Swimming said the 29-year-old, who is the most decorated Olympic athlete of all time with a total of 22 medals, including 18 golds, had violated the national governing body's Code of Conduct.

"Phelps' discipline is set forth under Section 304.3.19 of the 2014 Rule Book, which states 'Any other material and intentional act, conduct or omission not provided for above, which is detrimental to the image or reputation of USA Swimming, a LSC [Local Swimming Committee] or the sport of swimming'," read a statement from the organisation.

The sanctions include Phelps being barred from taking part in next year's World Championships in Kazan, an event that would have been a key part of his build-up to Rio 2016. 

"Phelps and USA Swimming each agree that Phelps will not represent the United States at the 2015 FINA World Swimming Championships in Kazan, Russia, from August 2-9," the statement added. 

Phelps has won a total of 32 medals at the World Championships, including 26 gold, since making his debut at Fukuoka in 2001, a total beaten by only seven countries in the 41-year history of the event. 

Michael Phelps will not compete at next year's International Aquatics Federation World Championships in Kazan in August ©Getty Images


Phelps, who, following his arrest, took to Twitter to say how "deeply sorry" he was, will also forfeit his USA Swimming funding for six months.

The move by the national body comes just a day after the athlete admitted that he needed to take a break from swimming to attend a "programme".

"Membership in USA Swimming, and particularly at the national team level, includes a clear obligation to adhere to our Code of Conduct," USA Swimming executive director Chuck Wielgus said.

"Should an infraction occur, it is our responsibility to take appropriate action based on the individual case.

"Michael's conduct was serious and required significant consequences.

"Michael has publicly acknowledged the impact of his decisions, his accountability especially due to his stature in the sport and the steps necessary for self-improvement.

"We endorse and are here to fully support his personal development actions."

Last week's incident was Phelps' second arrest for driving while intoxicated, the first coming in 2004.

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