He arrived in north London carrying a knee injury himself, but did not feature in either of the Gunners' friendly matches against Charlton Athletic or Brentford this week despite returning to fitness.
It is understood the 28-year-old suffered a facial injury and severe swelling after being hit by a ball during training.
Cedric has been wearing a protective mask over his nose since the incident and manager Mikel Arteta decided against risking him during the friendly matches behind closed doors.
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