The 2014 World Cup winner has just returned
from another injury layoff and played an hour after starting in
Dortmund's German Cup first round match against
Rielasingen-Arlen on Saturday.
"He will have to take a break for about four weeks," the club
said in a statement.
It was not clear when the player was injured but he is also
likely to be ruled out of selection for Germany's 2018 World Cup
qualifiers against the Czech Republic in Prague on Sept. 1 and
Norway in Stuttgart on Sept. 4.
Dortmund, who finished third in the Bundesliga last season, have
qualified for the Champions League group stage and open their
domestic league campaign at VfL Wolfsburg on Saturday.
(Reporting by Karolos Grohmann; Editing by John O'Brien)
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