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Arsene Wenger switched back to a 3-4-2-1 formation for the trip to Crystal Palace and, following the 3-2 victory, could retain that set-up at West Bromwich Albion.
Changes are unlikely in the front three, with Alex Iwobi and Danny Welbeck the options if Wenger seeks to freshen things up or switch back to a 4-2-3-1.
Calum Chambers was handed a rare start in the back three, and with Nacho Monreal still sidelined with an ankle injury, may keep his starting spot.
The change of formation meant Sead Kolasinac returned at left wing-back and he is likely to keep his place ahead of Ainsley Maitland-Niles providing Wenger sticks with a three-man backline.
Aaron Ramsey and Olivier Giroud remain out, while Granit Xhaka will need to be assessed having tweaked his groin late on at Selhurst Park. Santi Cazorla is a long-term absentee.