Laurent Koscielny
Arsenal skipper Laurent Koscielny is expected to be fit for Albion's visit to the Emirates on Sunday.
The central defender came off in the 3-1 Europa League semi-final first leg win over Valencia last night but is in contention to face the Seagulls.
Nacho Monreal replaced Koscielny and could come in from the start having overcome his own calf problem.
Danny Welbeck (ankle), Hector Bellerin and Rob Holding (both knee) are all out for the season.
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