Arsenal boss Arsene Wenger says everyone at the club are convinced of Ryo Miyaichi's ability.
The Japanese winger has been granted the work permit he required to play in England and, after completing the paperwork in Japan this week, is now available for selection.
"He is in the squad for tomorrow," Wenger told arsenal.com. "We are impressed by Ryo's quality, his spirit and his attitude.
"Everybody is absolutely convinced he will be an Arsenal player. He has a good understanding of the game, he is very quick, he is a fighter and has all the attributes that you love of a player at the top level.
"He is 18 years old and has come from College football straight to professional football so we want to give him time to adapt to the Premier League."
