Arsenal were held 1-1 by Olympique Marseille in yesterday's UEFA Youth League encounter.
The Gunners sit on top of the table after five games following this result, and will progress if Dortmund lose at home to Napoli on Tuesday.
Steve Gatting's side were on the back foot for much of the first half and Marseille twice went close before they grabbed the lead in the 35th minute through Antoine Kisaku.
The goal provoked an instant response from Arsenal, who restored parity through Kris Olsson's penalty after Chuba Akpom had been pulled down.
