FC Dallas midfielder Kellyn Acosta and defender Matt Hedges have been dropped from the U.S. national team training camp because of injuries, while Vancouver midfielder Kekuta Manneh has left to join the Whitecaps for preseason training.
Acosta has a mild left ankle sprain, and Hedges has a mild right knee sprain, the U.S. Soccer Federation said on Monday.
U.S. Soccer announced last week that Manneh has been granted citizenship, but he still must receive a waiver from FIFA to play for the U.S. team, since he was previously called in for Gambia's under-20 team.
They will not be replaced on the squad before the Americans play Serbia on Sunday in San Diego, in their first game since Bruce Arena replaced Jurgen Klinsmann as coach in November following losses to Mexico and Costa Rica in World Cup qualifiers.