Christian Pulisic was ruled out of Borussia Dortmund's Bundesliga clash at Hannover on Friday with a muscle injury:
Borussia Dortmund ud83cuddfaud83cuddf8ud83cuddecud83cudde7.@cpulisic_10 did not travel to Hannover (muscular problems) #H96BVB https://t.co/UFbNQzQI9y
Manager Lucien Favre brought in Marius Wolf in place of Pulisic for Dortmund's second league match of the new season.
The injury will be a worry to the United States ahead of the international break. Interim coach Dave Sarachan's side take on Brazil and Mexico in friendlies in September.
This article will be updated to provide more information on this story as it becomes available.