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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.