Television cameras filmed the England midfielder, who says himself he wears his heart on his sleeve and does not hide his feelings, raising a middle finger at the home supporters who were mocking him for appealing for a corner kick which never came.
The incident occurred with the score at 4-2, in what was otherwise a late contender for best football contest of 2013.
There is a precedent in place in this scenario, as Luis Suarez received a one-match ban for a similar offense during a Liverpool game against Fulham in 2011. Months prior to that, Wayne Rooney tried – and failed - to appeal a two-match ban for swearing in good range of a TV camera after scoring a hat-trick for Manchester United against West Ham.
Wilshere showing the City fans the finger is all over my Twitter! Remember Suarez getting a game ban for that, hope consistency is shown... — Rob Brown (@Robmeister1994) December 14, 2013
Manager Arsene Wenger is thus likely to have to cope without Wilshere, who also found himself in hot water earlier in the season after being pictured smoking outside a nightspot, for at least one upcoming fixture.
There was even more woe for Wenger when an angry confrontation erupted between Per Mertesacker and Mesut Ozil at the final whistle - with Mertesacker apparently incensed that his German compatriot had not applauded the visiting fans.
Ozil later apologised for his conduct via his official Facebook page:
"Sorry I didn't thank the fans at the end of the game!
"You have been brilliant to me and I know you had travelled a long way and spent your money to support us.
"I was upset with the result and know I should have come to you to say 'thank you' and I know it is a big Arsenal tradition win, lose or draw."