Manager Arsene Wenger decided to sign the gifted Japanese youngster last month after an impressive trial period over the summer.
18-year-old Miyaichi has represented his country at youth level and is a highly-regarded prospect. The winger, who is lightning quick, has already prompted comparisons to Arsenal legend Thierry Henry and Real Madrid star Ronaldo.
Miyaichi however, has shrugged off such praise, insisting he is still a raw player.
"I don't feel pressured (by the comparisons) but I know in myself that I have nowhere near the talent of such great players as Cristiano Ronaldo and Thierry Henry," he told Kyodo News. "I just have to do my best to one day come close to being the kind of players they are."
The Gunners’ previous Japanese import, Junichi Inamoto, failed to make a single league appearance in the team but Miyaichi has vowed to succeed where his compatriot failed.
He added: "I'm confident I have the ability to penetrate defenses over there and hopefully I'll be given the marks that I am looking for.
"I just have to go there and give it a shot, compete and hopefully one day I will be standing on the pitch at Emirates Stadium."
Miyaichi already has the backing of Wenger, after the Frenchman revealed his delight at his acquisition.
Wenger said: "I look forward to helping him fulfill his potential here at Arsenal."