The England international was part of the side that suffered a shock 2-1 defeat at Wembley back in 2011, as goals from Nikola Zigic and Obafemi Martins sealed a huge cup upset.
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On the anniversary of the defeat, one cheeky Blues fan took to Twitter to send Wilshere a picture of both the England midfielder and his team-mate, Wojciech Szczesny, looking despondent after the final whistle, asking: “Recovered yet?”
But he got a response he was not expecting when Wilshere re-tweeted his remark alongside a stinging reply: “Yes mate just about! Have Birmingham?!?”
The St Andrew's outfit have not come close to returning to English football's top-flight since their 2011 relegation and currently sit in 16th place in the Championship – 14 points shy of the promotion spots.
Arsenal, meanwhile, are in he thick of a title fight at the top of the Premier League table, and will take on Bayern Munich in the second leg of their Champions League last-16 clash in two weeks' time.