Arsenal have confirmed that defender Kieran Tierney has dislocated his shoulder in the 3-1 win over West Ham and will be out for three months.
The 22-year-old will face a surgery and could be out until March.
https://twitter.com/afcstuff/status/1204745014712131585?s=20
Arsenal's official statement on the player's injury: "Right shoulder. Dislocated right shoulder during the West Ham United (a) match. Currently undergoing further assessment and investigations."
source - afcstuff