Schurrle has only just returned from another injury, but will now be sidelined for a month.
The news will come as a blow to Dortmund, as they are facing the prospect of losing star man Ousmane Dembele to Barcelona this summer.
'He will have to take a break for about four weeks', the club announced in a statement.
Schurrle won't play for the German national team in their World Cup qualifier against Czech Republic on September 1.