Arsenal defender Kieran Tierney out up to three months

Arsenal's Kieran Tierney, center, leaves the field with medics during the English Premier League soccer match between West Ham Utd and Arsenal. (Kirsty Wigglesworth/AP)

LONDON — Arsenal defender Kieran Tierney is facing up to three months out with a dislocated shoulder.

The Scotland international was injured during Monday’s Premier League win over West Ham. Arsenal said Saturday that the left-back will have surgery next week and then begin a rehabilitation process that will last “around three months.”

Tierney was signed from Celtic in the off-season but also missed the start of the campaign with a groin problem.

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