Teams finishing between 9th and 24th will have to compete in a two-legged playoff to move on to the last 16 of the tournament.
Spanish giants FC Barcelona will be travelling to Monaco for their first game and will hope to bring the three points home as well.
Meanwhile, UEFA Super Cup runner-up Atalanta will take on Mikel Arteta's Arsenal, who will want to reach the business end of the competition again this season.
The story "UEFA Champions League matches on Sept 18: City, Barca and Arsenal in action" has 322 words across 18 sentences, which will take approximately 2 - 3 minutes for the average person to read.
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