Arsenal will need 10 points to get out of the "hardest" section in the Champions League, said manager Arsene Wenger on the eve of Wednesday's tough test at Olympique Marseille.
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The Londoners, beaten by eventual champions Bayern Munich in the first knockout round last season, also face Borussia Dortmund and Napoli in Group F.
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"If you look at the group I would say yes it is the hardest because all four teams have a chance to qualify," Wenger told a news conference.
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"That means every game is basically a very important one. On average you need 10 points to qualify so that gives you the task.
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"Some people think Dortmund and Napoli are our toughest opponents but I think Marseille are the same level," added Wenger.
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"Two years ago in a group quite similar Arsenal and Marseille went through. Nothing is written, it's very difficult to know which teams will qualify."
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The Frenchman said Arsenal, playing a 16th consecutive season in the Champions League, needed a good start in the south of France.
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"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," he said.
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"Whether it is home or away it is the same basically, we come here and we will try to win the game."
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Striker Olivier Giroud should be fit to start despite coming off against Sunderland at the weekend with a knee problem.
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The Frenchman had a fitness test on Tuesday that Wenger said was "very positive".
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Defender Per Mertesacker is also available after illness.