The U.S. international came off in the 70th minute of Borussia Monchengladbach's 2-1 loss to Schalke on Friday.
The debate over what position Fabian Johnson should play for the U.S. national team during its upcoming World Cup qualifiers may now be a moot point.
Johnson exited Borussia Monchengladbach's 2-1 loss to Schalke on Friday with a right adductor strain, the club announced, throwing the 28-year-old's national team availability into question.
The U.S. resumes World Cup qualifying with a trip to face Guatemala on March 25 before hosting the same opponent in Columbus, Ohio, four days later.