"Mentally it has been tough because you question yourself all the time. You go to the Emirates, you watch games and you think 'Has it got quicker? I don't remember it being this quick. Can I get back to this level that I was at before?'" he told reporters.
"But I feel good now and hopefully, with a few more games, I can get back to my best."
However, Roy Hodgson has revealed that Wilshere will not start on Wednesday.