The England international was sidelined for 17 months due to ankle and knee problems before making his comeback two years ago.
And while Wilshere has been criticised for failing to deliver on the potential he showed as a 17-year-old rookie, he has caught the eye with some impressive displays of late.
"I feel good and I'm always looking to improve, no matter what," Wilshere told his club's official website.
"For a player of my age, I've missed a lot of football so I'm just trying to play as much as I can, train as much as I can and I've always said that when I get fully fit you'll see the best of me.
"I said at the start of the season that it was going to take some time to get back to my best. Ever since my first injury, it's always taken a run of games - probably between five and 10 - to get back to my best.
"Some players are different, some players come back and are at their best straight away. But some need a run of games and I'm one of those players."