Long jumper Dwight Phillips will miss the Olympic trials because of a recurring injury to his Achilles.
Phillips won the gold medal in the event at the 2004 Athens Games. He didn't get to defend his title as he finished fourth at the trials in 2008 and was left off the U.S. Olympic squad.
The 34-year-old Phillips posted on his Twitter account: ''I have had surgery and I am looking forward to competing at the World Championship in 2013 which will be my final year.''
Phillips is a four-time gold medalist at worlds, including last summer in South Korea.