DIEGO Lugano is handed his first start in 13 games as Pepe Mel makes two enforced changes to the team that beat West Ham 1-0 last weekend.
Billy Jones, having only returned from a lengthy spell on the sidelines with a hamstring problem 13 days ago, is rested as a precaution as the Baggies set out on three games in a week.
And Steven Reid is forced to miss out due to the groin injury he sustained against the Hammers - forcing a reshuffle in defence.
James Morrison is also elevated from the bench to the starting XI.
Albion are buoyed by the return of Gareth McAuley among the substitutes after a two-game absence due to a calf injury.
Thievy misses out altogether, with Scott Sinclair and Liam O’Neil back on the bench.
Arsene Wenger makes just one change to the Gunners team that beat Newcastle 3-0 last weekend.
Mathieu Flamini comes in for Aaron Ramsey, who is left out altogether.
ARSENAL: Szczesny, Sagna, Mertesacker, Koscielny, Monreal, Flamini, Arteta (c), Cazorla, Ozil, Podolski, Giroud. Subs: Fabianski (gk), Jenkinson, Vermaelen, Kallstrom, Rosicky, Diaby, Sanogo.
ALBION: Foster, Dawson, Lugano, Olsson, Brunt (c), Amalfitano, Mulumbu, Morrison, Dorrans, Sessegnon, Berahino. Subs: Myhill (gk), Anichebe, O’Neil, Sinclair, Vydra, McAuley, Yacob.
REFEREE: M Jones (Cheshire).