The pair exchanged words after United's 3-2 win, with a video recording showing Maguire unimpressed by Gabriel's refusal to shake hands with him.
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Maguire shoved the Brazilian before United goalkeeper Senne Lammens guided the Arsenal defender away.
The pair, despiite lining up at the opposite ends of the pitch, regularly clashed over the 90 minutes at set-pieces and corners.
Watch below: