The fullback was injured in Eintracht's 4-1 win over Stuttgart on Saturday and will undergo knee surgery.
The U.S. national team's fullbacks are having a rough weekend in terms of injuries.
Saturday saw DaMarcus Beasley pick up a calf injury that could rule him out of the USA's upcoming friendly matches against Peru and Brazil, and on Sunday Eintracht Frankfurt announced that Timmy Chandler picked up a meniscus injury that would require surgery.
INJURY Timmy Chandler suffered a meniscus injury yesterday, will need to undergo surgery. Get well soon Timmy! #SGE pic.