The Bosnia worldwide was forced off during Wednesday's pre-season win over London rivals Chelsea in Dublin after a clash with Victor Moses.
The gunners have suffered two major injury blows ahead of the 2018/19 season after the club has confirmed that Aaron Ramsey and Sead Kolasinac won't be taking part in Arsenal's friendly match against Lazio on Saturday in Stockholm.
The 25-year old had to be helped off the pitch following a collision with Chelsea wing-back Victor Moses, and was due to undergo a scan to reveal the extent of the injury on Thursday.
The Wales worldwide, who withdrew from the game against Maurizio Sarri's side due to a tight calf, is aiming to return to training next week.
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Developed tightness in his right calf.
Arsenal star Sead Kolasinac has been ruled out for almost three months after suffering an injury. Aiming to train next week. Will be out for 8-10 weeks.
Ainsley Maitland-Niles, who is more suited to playing in midfield, is capable of providing cover at left-back if required.
Kolasinac's absence means Nacho Monreal is likely to be thrown straight into the starting lineup when the Gunners take on Manchester City next weekend in the opening round of the Premier League.