The boys remain unbeaten away from home this season after a hard-fought victory over Crystal Palace on Saturday.
Mikel put the Gunners in front from the spot two minutes after half-time before he was sent off after a collision with former Gunner Marouane Chamakh.
But Olivier headed home late on to keep Arsenal top of the Premier League. You can see a bitesize clip of the game by clicking the play button above.
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