Atalanta host Arsenal in the opening week of the new Champions League season.
The match is being played at Gewiss Stadium in Bergamo, Italy.
Arsenal are second in the Premier League, the same place where they finished last season, with three wins and a draw from their opening four matches.
Atalanta have won two and lost two of their opening four matches in Serie A and sit ninth in the Italian top flight.
Defending Champions League winners Real Madrid beat Stuttgart 3-1 on Tuesday.
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