The clip, which has since been deleted from Arsenal’s official YouTube account, was quickly seized upon by fans and uploaded.
It shows the Armenian winger, who arrived from Old Trafford in a swap deal with Alexis Sanchez yesterday, posing in his Arsenal strip.
Loud music blasts out during the video – but he appears to mouth: “Yo Pierre, do you want to come here?”
“This could be legendary from the media team,” wrote one Arsenal fan.
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Another said: “I already love this man.”
The Gunners are believed to be close to a deal to sign wantaway striker Aubameyang from Borussia Dortmund – a move that would reunite Mkhitaryan with his former Bundesliga team-mate.
Arsenal boss Arsene Wenger hailed 29-year-old Mkhitaryan after his arrival at the Emirates yesterday, claiming he is as good a player as Alexis Sanchez – who arrived at Manchester United in a swap deal yesterday.
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"Mkhitaryan can play on the wing or in midfield, so I believe he can play very well in many positions,” he said.
“That can help us as well because he can play together with Ozil as well as playmaker, so overall it’s a good move.”
Arsenal are back in action tomorrow night in the second leg of their Carabao Cup tie against Chelsea, with the scores tied at 0-0.