Christian Pulisic, who will link up with Chelsea in pre-season after being loaned back to Borussia Dortmund in January, opened the scoring after four minutes in the USA’s game against Chile.
However, he was replaced by Sebastian Lletget in the 36th minute after suffering from muscle problems.
His National team head coach Gregg Berhalter has moved to play down any major injury fears.
"I’m not worried," Berhalter told
reporters. "You look into the why, you do an inquiry of why that’s happening, and you make adjustments.
"He’s at a top club, he’s going to a top club [in Chelsea].
"We have very high-level medical personnel on our side and we’ll get it right."