The match was played was staged at St George's Park and blocked off from the public and media.
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The Gunners won 3-0, with United having Australia fullback James Overy sent off for two yellow cards.
Featuring for Arsenal was Gabriel Jesus, who is in the final stretch of his recovery from knee surgery.
Also playing for Arsenal, reports Nathan Salt, was Alex Oxlade-Chamberlin. The veteran midfielder is training with his former club after his release from Besiktas.
Another to feature was Max Dowman, who missed the first team's defeat at Aston Villa yesterday.