Sahin admitted that Dortmund need to win their remaining two games to qualify, but said that the same applies to the Italian and English sides.
"In the first game we were the more effective side, but this time it was Arsenal," UEFA.com quotes Sahin as saying. "They beat us with a fortuitous goal. We could have pulled away with a victory today, but it wasn't to be.
"Whoever wants to qualify from this group is going to have to win their final two matches. The same still goes for Arsenal, in my opinion. We have to move on. Life goes on and will go on. We just have to get the three points against Napoli."
Dortmund return to Bundesliga action at the weekend to take on Wolfsburg.