Albion head coach Steve Clarke could be without strikers Victor Anichebe (groin), Shane Long (knee) and Nicolas Anelka (foot), leaving the door open for 20-year-old Berahino to potentially step in.
Midfielders James Morrison and Chris Brunt should also be available but Scott Sinclair (hamstring) is absent while Matej Vydra, Ben Foster, George Thorne and Zoltan Gera are all working their way back to full fitness.
Arsenal will be without defender Bacary Sagna for Sunday's Barclays Premier League trip to West Brom after the France international suffered a hamstring problem which could sideline him for three weeks.
Carl Jenkinson is set to come into the team, while England midfielder Jack Wilshere is pressing for a recall after starting on the bench for the 2-0 midweek Champions League win over Napoli.
Forward Theo Walcott, Santi Cazorla, Yaya Sanogo, Lukas Podolski, Alex Oxlade-Chamberlain and Abou Diaby are all still recovering.
Arsène Wenger may have lost his place at the top of the Premier League when his team kick off at The Hawthorns, but nothing can damage the feel-good factor that currently pervades Arsenal.
The miserable summer experience of the transfer window now seems a distant memory and Wenger has even found himself having to dampen talk of possible title challenges.
This will be Arsenal's second visit to West Brom inside two weeks but Steve Clarke's evolving team could not be in better shape after an excellent, and ultimately deserved, win at Old Trafford last Saturday.
Betting: Home 3-1, Away 5-6, Draw 14-5.
Stat of the game: Arsenal have won their last eight away games in the Premier League and will set a club record with a victory at The Hawthorns.
John Percy's prediction: West Bromwich Albion 2 Arsenal 2.