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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.