The former Fulham striker, now with Major League Soccer’s Seattle Sounders, suffered the injury Monday in Zurich ahead of Wednesday’s match against Denmark at Aarhus. He has returned to Seattle and is expected to miss two or three weeks.
The Americans will also face Switzerland next Tuesday in Zurich.
No roster replacement will be added for the Danish match, officials said, leaving the US squad with only three forwards — Toronto’s Jozy Altidore, Utrecht’s Rubio Rubin and AZ Alkmaar’s Aron Johannsson.
The Americans will make another trip to Europe in June, facing the Netherlands in Amsterdam and world champions Germany in Cologne. Those will be tuneup matches for next July’s Gold Cup, the North American continental tournament in which the US side can clinch a spot in the 2017 FIFA Confederations Cup in Russia