Jonathan Spector has withdrawn from the United States squad to face Spain on Wednesday night as he has headed to California for treatment on his hip injury.
The 22-year-old defender had been named in the 24-man party travelling to Santander for the international friendly despite missing last week's 2-0 defeat by England at Wembley. At the time, Spector was not certain whether he would be fit to feature in the Spain game or this Sunday's friendly against Argentina in New Jersey.
"I am not 100 per cent sure yet," he said at Wembley. "We will see how it goes. For me it was really disappointing to miss the England match." Spector has since been diagnosed with a tear to the labrum, the cartilage in his hip, and will get further advice from US national team director Michael Gerhardt in Los Angeles although it is thought he could miss the US's entire summer programme, including World Cup qualifiers and the Olympics.