Arnold, and Dani Carvajal are all missing from the matchday squad, leaving Xabi Alonso’s side to face the Italian giants with a depleted backline.

An analysis of the state of play in Europe's premier club competition following the conclusion of the third round of fixtures

Arsenal is one of the favorites to take home the English Premier League title, while also hopeful to make a deep run in the UCL. They punched their ticket to the Champions League for a third year in a row by finishing third in the EPL once again. The Gunners have picked up wins over Athletic Club and Olympiacos so far in UCL play.

In a bit of gamesmanship, the showers at the Emirates Stadium did not have hot water for Atleti, who filed a complaint with UEFA. That caused the La Liga side to travel back to their London hotel to shower. Arsenal apologized and indicated the malfunction affected the showers in both dressing rooms at the stadium and was fixed.