Arsenal manager Arsene Wenger has said that Wednesday's Champions League clash against Borussia Dortmund in Germany will not be "decisive".

The Gunners will head into their game with last season's beaten finalists as Group F leaders, but both the German giants and Napoli are level with them on six points.

"Dortmund are a very positive side, we are a very positive side, so at least you have the guarantee that two teams will try to win the game," UEFA.com quotes the Frenchman as saying.

"I don't know if this will be a decisive match – it also depends what happens between Marseille and Napoli – but it is a very important match for us now, because we lost at home and now have to win the away games."

In the other Group F game on Wednesday, Napoli will welcome Marseille to Naples.