كتب : وكالات
The Egypt forward replaced Japan playmaker Shinji Kagawa five minutes from time, when Arsenal were leading by a goal from Robin van Persie at Signal Iduna Park.
With less than two minutes left, another substitute grabbed the dramatic equalizer for Dortmund as Ivan Perisic beat Wojciech Szczesny with a superb volley.
Dortmund will visit Marseille in their next Group F game later this month as the French giants beat Olympiacos 1-0 in Greece.