New signing Trossard was excused from training by Arsenal to be with wife as she welcomed a new child on Monday.
Watch: Folarin Balogun all three goals against FC Lorient as he helps his side come from a two goal deficit to win 4-2
Trossard, who can play across all forward positions was signed this January window from Brighton to provide extra cover for Martinelli.
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The Gunners will seek to extend their league points to 53 when they face Everton on Saturday.