Forward Eddie Johnson has a left hamstring sprain, according to U.S. Soccer. Johnson is in Princeton, N.J., with the others called up for a U.S. training camp to prepare for the World Cup.
Johnson picked up the injury with his club side, FC Aris, in a Greek playoff game against AEK Athens on May 12. He is listed as day-to-day.
The injury could impact Johnson's World Cup chances. He faces steep competition from the other strikers in the U.S. 30-man preliminary roster to make the final 23 which will travel to South Africa.
Brian Ching, Herculez Gomez, Edson Buddle, and Robbie Findley are all vying for a spot next to Jozy Altidore up front for the United States.
The United States will face the Czech Republic in an international friendly on May 25. Friendlies against Turkey and Australia will follow before the Stars and Stripes kick off their World Cup campaign against England on June 12.
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