Having been associated with the Gunners for 17 years, the England international walked away from north London as a free agent over the summer.
Unai Emery’s arrival at Emirates Stadium saw Wilshere opt against signing fresh terms, with the 26-year-old seeking a new challenge.
He has found that with West Ham and will be looking to “prove a point” to those who let him go when his path crosses with Arsenal again on Saturday.
Wilshere told the Hammers’ matchday programme: “First of all, I've got to concentrate on football and I quite fancy our chances. I obviously know them really well.
“They've got a new manager, but I know the players, so hopefully it'll be a good time to play them.
“It'll be a strange one for me as I was never able to go there and play when I went out on loan as you can play against your parent club, but it's one I'm looking forward to.
“It's down to me to prove a point to Arsenal that they were wrong to get rid of me.”
Wilshere has not enjoyed the best of starts to his time in new surroundings.