Wilshere left Arsenal - a club he had represented for 17 years - on a free transfer earlier this summer, but will be back at the Emirates Stadium in a West Ham shirt this weekend.
The 26-year-old has also backed his new team to cause an upset on Saturday afternoon, with Arsenal still getting used to life under new head coach Unai Emery.
“First of all, I’ve got to concentrate on football and I quite fancy our chances. I obviously know them really well,” Wilshere told West Ham’s official matchday programme.
“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.”