Kieran Tierney suffered a shoulder injury for Arsenal on Monday during their Premier League match at West Ham United.
The Scotland international was forced off after 30 minutes with his arm in a sling as he left the field of play.
Sead Kolasinac replaced the full-back, with the Gunners also losing Hector Bellerin to injury in the warm-up.
This article will be updated to provide more information on this story as it becomes available.
Get the best sports content from the web and social in the new B/R app.