"I have so many things flying through my head right now. I've already said live on TV that Gooch [Oguchi Onyewu] played 90 minutes when we subbed him in the 65th minute so you can imagine where I'm at.
"At times it was a little bit crazy and I think in the process of trying to put so much into it we at times left ourselves wide open."
Despite front-line players, including Everton goalkeeper Tim Howard and midfielders Landon Donovan, Michael Bradley and Fulham's Clint Dempsey, being rested and defenders Carlos Bocanegra and Jay DeMerit still recuperating from injuries, the US took the lead in the 17th minute when Rangers' Maurice Edu pounced on a loose ball to score from close range.
However, the Czechs turned the game on its head either side of half time when firstly Tomas Sivok headed them level before Jan Polak found space at the far post to fire them ahead just before the hour.
Seven minutes later, the US gave themselves hope of a positive result when Herculez Gomez headed in but a 78th-minute strike from Martin Fenin and Tomas Necid's injury-time turn and finish gave the Czech's the victory.
Bradley will take his 23-man squad to Philadelphia for Saturday's farewell home game against Turkey before the US travel to the World Cup.
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