The Scotland left-back will go through a medical procedure in the "impending days", a Gunners proclamation affirmed.
Tierney, 24, experienced the injury during an instructional course last week and missed Monday's 3-0 loss at Crystal Palace.
He has played 22 association games this season for Arsenal, who sit fifth in the table, outside the Champions League puts on objective contrast.
The requirement for medical procedure, after meeting with a trained professional, likewise raises questions about Tierrney's accessibility for Scotland's World Cup capability set up to contend with Ukraine in June.
Weapons store said "a more clear agreement will be laid out on his recuperation timescale" post-medical procedure, however they anticipated that he should miss the rest of the mission.
In the mean time, individual Gunners safeguard Takehiro Tomiyasu ought to continue preparing in a fortnight following two months out with a calf injury.
Midfielder Thomas Partey, be that as it may, bothered a thigh issue in the misfortune at Selhurst Park and will be evaluated before Brighton's visit to Emirates Stadium on Saturday.
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