Michael Phelps is to return to the competitive pool later this month two years after hanging up his swimming cap and goggles.
The most successful Olympian in history retired after the 2012 London games but returned to training last year.
He re-entered the United States drug-testing programme and has completed the required six-month waiting period to be eligible for competition.
The 28-year-old American is expected to compete at a meeting in Mesa, Arizona starting April 24 when he will test his form against fellow Olympian Ryan Lochte and others.
Phelps – nicknamed the Baltimore Bullet – has won a career 22 Olympic medals – 18 of which are gold.
He won a record-breaking eight gold at a single Games in Beijing 2008.
If his return goes to plan Phelps could be on track for a fifth career Olympics at the 2016 Games in Rio.