Alex Oxlade-Chamberlain and Theo Walcott have both suffered injuries in the first half of Arsenal's 3-0 loss to Sheffield Wednesday in the third round of the League Cup.
Oxlade-Chamberlain lasted just five minutes before hobbling from the field with a suspected hamstring injury.
He was replaced by Walcott, but he too left the field in the 20th minute clutching his calf.
The duo had to look on from the bench as goals from Ross Wallace, Lucas Joao and Sam Hutchinson saw the Gunners suffer a shock loss at Hillsborough.
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