Klinsmann: Holden injury could be 'very serious'

[GOLD CUP: Final] U.S. national team midfielder Stuart Holden, who capped his comeback summer by starting in Sunday’s GoldCup final, had to go off with a knee injury suffered in the first half. Afterwards, U.S. national team coach Jurgen Klinsmann said everyone was very concerndabout the injury that could be “very serious.”