Michael Phelps is coming out of retirement, lured back into the pool by the fun of it and the possibility of swimming at a fifth Olympics in Rio in 2016.

The 22-time Olympic medalist will compete for the first time since the 2012 London Games at a meet in Mesa, Ariz., on April 24-26.

Bob Bowman, the swimmer's longtime coach, told The Associated Press on Monday that Phelps is entered in three events -- the 50- and 100-meter freestyles and the 100 butterfly.

"I think he's just going to test the waters a little bit and see how it goes," Bowman said by phone from Baltimore. "I wouldn't say it's a full-fledged comeback."

Phelps returned to training last fall and re-entered the U.S. drug-testing program. He has completed his six-month waiting period by the U.S. Anti-Doping Agency to be eligible for competition.

Bowman said Phelps is "pretty far" from being back in top form. He has been training Monday through Friday with Bowman's team at the North Baltimore Aquatic Club.

"He's gotten back into good shape since September," the coach said. "He can give a good effort and certainly not be embarrassed. He's in enough shape to swim competitively."

Besides Phelps, USA Swimming said Olympians Ryan Lochte and Katie Ledecky are among those expected to swim in the Arena Grand Prix at Skyline Aquatic Center.