The 22-year-old came on as a late substitute for the Gunners as they claimed a 3-2 victory over Hull City to win the FA Cup on Saturday.
Wilshere has suffered with injury problems this season, but he says that he is feeling fresh as he looks to book his spot in England's 23-man squad for Brazil.
"I feel ready and sharp for Portugal," The Mirror quotes him as saying. "I am going to enjoy the cup, then enjoy the parade, and then hopefully go on to England. This is my first feeling of winning something and there is no better feeling.
"I have been training for three weeks. I haven't been in the squad because we agreed with the manager that it was right that I got a good base fitness.
"So I have been in the last two squads and I have played 45 minutes altogether. I feel fresh and a good week of training in Portugal will do me good."
Wilshere has made 15 appearances for England since making his debut in 2010.