Arsenal have had a Summer to forget with a severe lack of signings and an opening day defeat at the hands of Aston Villa.
This draw won't have helped with all four teams having a decent chance of qualification.The Gunners now face the prospect of a Group F containing three sides with a proud European pedigree.
Here we take a closer at who blocks Arsenal's path to the last 16, with last season's beaten finalists Borussia Dortmund, Serie A giants Napoli and Ligue 1 contenders Marseille.
Borussia Dortmund - Jurgen Klopp's side reached the final of the Champions League last year, beating Real Madrid and Shakhtar Donetsk along the way. However they fell short of the crown at the hands of Bayern Munich, which broke the hearts of more than 40,000 Dortmund fans who travelled to Wembley in May. Despite this blow I predict them to bounce back and with the likes of Marco Reus and Robert Lewandowski they have the potential to go all the way again.
Napoli - Although they lost Edinson Cavani to PSG during the close season for a fee of £55m, Napoli have strengthened their squad with the likes of Gonzalo Higuain and Jose Callejon. Also they have appointed Rafael Benitez as their manager and with his European experience, it could be a very successful year for the Italian Club if he gets things right at the San Paolo Stadium.
Marseille - They may not be as strong as the other two clubs but Marseille have an excellent bunch of players including Mathieu Valbuena and Nicolas N'Koulou. Also they've finished runners-up in Ligue 1 to only big spenders PSG. Elie Baup's men have a settled side capable of producing a strong challenge, led by in-form striker Pierre-Emerick Aubameyang.
So looking back at an intriguing group, all four teams them have the potential to go a long way but only two can qualify for the knockout stages.
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