The 19-year-old has joined the Latics on a season-long loan.
Miyaichi joined the Gunners in 2010 and has since spent time on loan at Feyenoord and Bolton.
The youngster impressed while on loan at Bolton last season.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.