USA national team boss Juergen Klinsmann admits he is concerned about Stuart Holden.

The unlucky midfielder sustained another right knee injury in the first half of the USA's 1-0 CONCACAF Gold Cup final victory over Panama on Sunday and Klinsmann fears the worst.

"We are very concerned about his situation," Klinsmann said in the postgame press conference. "It looks like a very serious knee injury."

Bolton's Holden, who only returned to national team action in May, has struggled over the past two years with two serious knee injuries but was maintaining a positive outlook as he always does.

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