Germany international Shkodran Mustafi has hit the ground running at Arsenal since joining the North London based outfit over the summer from Valencia.
Mustafi has already established himself as a first choice defender for the Gunners and is set to star in his first clash against United at Old Trafford.
The 24-year-old defender revealed that he is ready for the United clash and shared a picture of himself from training.
Arsenal could move into first place in the Premier League depending on other results with a victory over United.