The United States confounded all pre-tournament predictions by battling their way out of a daunting Group G, finishing behind Germany but claiming the runners-up spot ahead of Portugal and Ghana.
Klinsmann acknowledged, however, that his team must improve on last Thursday's 1-0 defeat by the Germans in Recife if they are to provide another shock by eliminating Belgium, regarded by many as tournament dark horses.
Of particular concern to Klinsmann is his team's attack. According to FIFA statistics compiled after the completion of the first round, the United States had just 72 attacks in three games -- putting them 31st among 32 teams.
"It's definitely something we learnt out of the Germany game," Klinsmann said. "We were too deep, especially the first 20 minutes.
More From This Section
"I was screaming my lungs off there to get the back line out and to move the entire unit higher up the field.
"So we'll work on that over the next couple of days in training, to shift the entire game forward and through that put more pressure on the opponent and create more chances. This is really one of our goals.