The Gunners have won their last five league matches, including last weekend's 2-1 success at Swansea City.
West Brom have won their last two games, including last week's 2-1 victory over Manchester United, which was the club's first win at Old Trafford since 1978.
Arsenal come into the match on the back of a Champions League win over Napoli in midweek.
Morgan Amalfitano is expected to start after scoring in his last two Premier League appearances.
West Brom: LDLDWW
Possible starting lineups
West Brom: Myhill; Jones, McAuley, Olsson, Ridgewell; Yacob, Mulumbu, Amalfitano, Sessegnon, Berahino; Anichebe
Arsenal: Szczesny; Jenkinson, Mertesacker, Koscielny, Gibbs; Flamini, Wilshere, Ramsey, Gnabry, Ozil; Giroud
Sports Mole says: 1-2