Willian and Gabriel Magalhaes are the only other new faces through the door, with Dani Ceballos returning for another season-long loan, and Pablo Mari and Cedric Soares having their loans made permanent.
Arsenal have won their first two matches of the Premier League season.
The 3-0 opening-day win over Fulham was backed up by Saturday’s 2-1 victory over West Ham.
Arteta’s side had to wait until the closing stages to find the winning goal, which came through substitute Eddie Nketiah.
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