Mustafi made the move to Arsenal from Valencia over the summer transfer window.
The 27-year-old shared a photo of Mustafi celebrating a goal during training along with the caption, “This guy knows how to celebrate a goal.”
Arsenal fans will be hoping Mustafi can show off his celebration this weekend when the Gunners take on Swansea City in the Premier League.
The north London based club come into the game in good form following five wins in a row. Meanwhile, Swansea City recently appointed the former USA national team boss as their manager.