Arsène Wenger believes Arsenal are in the toughest Champions League group of all - and he thinks 10 points should be enough to qualify.

Last season's beaten finalists, Borussia Dortmund, and Serie A leaders Napoli both lie in wait after the Gunners kick off their Group F campaign with a tricky trip to French giants Marseille on Wednesday.

It is the hardest group because all the four teams have a chance to qualify

It's a mouthwatering schedule but a daunting one too and Wenger knows the size of the task ahead.

"If you look at the group, I would say yes it is the hardest group because all the four teams have a chance to qualify," he said.

"That means the every game is basically a very important one. On average you need 10 points to qualify so that gives you the task. Ten points in a group as a difficult as that could be a reasonable number to get through."

Arsenal have strung together nine straight wins in all competitions - a run that includes Champions League victories at Bayern Munich and Fenerbahce - and Wenger believes more away points are imperative.

"It will play a big part because it is difficult to predict that you will absolutely win your three home games," he said.

"You need points away from home and, like in every competition, the start is very important for the confidence of the team and to put you in a good position. Whether it is home or away, it is the same basically, we come here and we will try to win the game."

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source Chris Harris 17 Sep 2013