The Armenian international has been at the German club for a matter of days after joining from Shakhtar Donetsk despite interest from Liverpool.
But after limping out of their friendly at FC Luzern on Tuesday, the 24-year-old will miss the DFL-Supercup fixture with Bayern Munich next week as well as the start of both the Bundesliga and DFB-Pokal (German Cup) campaigns.
"Henrikh Mkhitaryan has been injured in the pre-season friendly and tests have proved he will be out of action for about four weeks overall,” confirmed a Dortmund spokesman.
- Sports & Recreation
- Shakhtar Donetsk
- Bayern Munich